50278 + Interview Questions in Physics

1.	A laser beam is used for carrying out surgery, because it
Answer» A laser beam is used for carrying out surgery, because it

Discussion

2.	If the time period (T) of vibrations of a liquid drop depends on the surface tension (S) of the fluid over which it is kept, radius (r) of the drop and density (ρ) of the liquid then the equation of T is [here, k is a dimensionless proportionality constant]
Answer» If the time period $(T)$ of vibrations of a liquid drop depends on the surface tension $(S)$ of the fluid over which it is kept, radius $(r)$ of the drop and density $(ρ)$ of the liquid then the equation of $T$ is [here, $k$ is a dimensionless proportionality constant]

Discussion

3.	A ball of mass 1 kg is attached to an inextensible string. The ball is released from the position shown in figure. Find the magnitude of impulse imparted by the string to the ball immediately after the string becomes taut. Take g=10 m/s2.
Answer» A ball of mass $1 kg$ is attached to an inextensible string. The ball is released from the position shown in figure. Find the magnitude of impulse imparted by the string to the ball immediately after the string becomes taut. Take $g = 10 {m/s}^{2}$ .

Discussion

4.	A solid sphere of mass 1 kg and radius 10 cm rolls down an inclined plane of height 7 m. The velocity of its center as it reaches the ground level is
Answer» A solid sphere of mass $1 kg$ and radius $10 cm$ rolls down an inclined plane of height $7 m$ . The velocity of its center as it reaches the ground level is

Discussion

5.	Two paper screens A and B are separated by 150 m. A bullet pierces A and B such that hole in B is h=15 cm below the hole in A. If the bullet is travelling horizontally at the time of hitting A, then the velocity of bullet at A is
Answer» Two paper screens $A$ and $B$ are separated by $150 m$ . A bullet pierces $A$ and $B$ such that hole in $B$ is $h = 15 cm$ below the hole in $A$ . If the bullet is travelling horizontally at the time of hitting $A$ , then the velocity of bullet at $A$ is

Discussion

6.	A loaded truck travels 14 km in 25 minutes. If the speed remains the same, how far can it travel in 5 hours? [2 MARKS]
Answer» A loaded truck travels 14 km in 25 minutes. If the speed remains the same, how far can it travel in 5 hours? [2 MARKS]

Discussion

7.	Why is rms velocity and not average velocity considered in case of gases?
Answer» Why is rms velocity and not average velocity considered in case of gases?

Discussion

8.	Show that, of all the rectangles inscribed in a given circle, the square has the maximum area.
Answer» Show that, of all the rectangles inscribed in a given circle, the square has the maximum area.

Discussion

9.	Two masses 2 kg and 3 kg are attached to the end of the string passed over a frictionless pulley fixed at the the top. The tension in the string and acceleration of the masses are
Answer» Two masses $2 k g$ and $3 k g$ are attached to the end of the string passed over a frictionless pulley fixed at the the top. The tension in the string and acceleration of the masses are

Discussion

10.	15 J of heat is added to a monoatomic ideal gas in a process in which the gas performs a work of 5 J on its surroundings . Find the molar heat capacity of the gas during the process.
Answer» $15 J$ of heat is added to a monoatomic ideal gas in a process in which the gas performs a work of $5 J$ on its surroundings . Find the molar heat capacity of the gas during the process.

Discussion

11.	A body falls from rest under gravity and travels half of its total path in the last second. Find the time of fall in seconds. (Take g=10 ms−2)
Answer» A body falls from rest under gravity and travels half of its total path in the last second. Find the time of fall in seconds. (Take $g = 10 {ms}^{- 2}$ )

Discussion

12.	A wire stretched between two rigid supports vibrates in its fundamental mode with a frequency of 45 Hz. The mass of the wire is 3.5×10−2 kg and its linear density is 4.0×10−2 kg m−1. What is the tension in the string?
Answer» A wire stretched between two rigid supports vibrates in its fundamental mode with a frequency of $45 Hz$ . The mass of the wire is $3.5 \times 10^{- 2} kg$ and its linear density is $4.0 \times 10^{- 2} {kg m}^{- 1}$ . What is the tension in the string?

Discussion

13.	A particle of mass m starts moving in a circular path A of constant radius r in such a way that its centripetal acceleration ac is changing with time as ac=k2r2t2 where k is a constant. What is the power delivered to the particle by the force acting on it?
Answer» A particle of mass $m$ starts moving in a circular path $A$ of constant radius $r$ in such a way that its centripetal acceleration $a_{c}$ is changing with time as $a_{c} = k^{2} r^{2} t^{2}$ where $k$ is a constant. What is the power delivered to the particle by the force acting on it?

Discussion

14.	If surface area of a cube is changing at a rate of 6 m2/s , find the rate at which length of the body diagonal changes, at a moment when side length is 1 m.
Answer» If surface area of a cube is changing at a rate of $6 m^{2} / s$ , find the rate at which length of the body diagonal changes, at a moment when side length is $1 m$ .

Discussion

15.	A body is projected with a velocity of 40ms-1.After 2s,it crosses a vertical pole of length 20 calculate the angel of projection and horizontal range, g=10 ms-2
Answer» A body is projected with a velocity of 40ms^-1.After 2s,it crosses a vertical pole of length 20 calculate the angel of projection and horizontal range, g=10 ms^-2

Discussion

16.	Two photons having
Answer» Two photons having

Discussion

17.	If two quantities have same dimensions, do they represent the same physical content?
Answer» If two quantities have same dimensions, do they represent the same physical content?

Discussion

18.	At what maximum mass M (in kg) of the block, the bars m1 and m2 will not slide over each other? If the coefficient of friction between the bars is equal to μ=18, and the coefficient of friction on the plane is equal to zero. Strings are massless and inextensible, pulleys are ideal. (take g=10 m/s2)
Answer» At what maximum mass $M$ (in kg) of the block, the bars $m_{1}$ and $m_{2}$ will not slide over each other? If the coefficient of friction between the bars is equal to $μ = \frac{1}{8}$ , and the coefficient of friction on the plane is equal to zero. Strings are massless and inextensible, pulleys are ideal. (take $g = 10 m / s^{2}$ )

Discussion

19.	Three equal weights of mass 2 kg each are hanging by a string passing over a fixed pulley. The tension in the string (in N) connecting B and C is
Answer» Three equal weights of mass $2 kg$ each are hanging by a string passing over a fixed pulley. The tension in the string (in $N$ ) connecting $B$ and $C$ is

Discussion

20.	A positive charge q exerts a force of magnitude - 0.2 N on another charge, which has a magnitude twice as the other charge. Find the magnitude of each charge if the distance separating them is equal to 50 cm. (Ans = 1.66 × 10-6 C)
Answer» A positive charge q exerts a force of magnitude - 0.2 N on another charge, which has a magnitude twice as the other charge. Find the magnitude of each charge if the distance separating them is equal to 50 cm. (Ans = 1.66 × 10-6 C)

Discussion

21.	Question: A 6-kg weight is fastened to the end of a steel wire of unstreched length 60 cm. It is whirled in a vertical circle and has an angular velocity of 2 revolution per second at the bottom of the circle. The area of cross-section of the wire is 0.05cm2. The elongation of the wire when the weight is at the lowest point of the path is (Ysteel=2×1011Pa)
Answer» Question: A 6-kg weight is fastened to the end of a steel wire of unstreched length 60 cm. It is whirled in a vertical circle and has an angular velocity of 2 revolution per second at the bottom of the circle. The area of cross-section of the wire is 0.05cm2. The elongation of the wire when the weight is at the lowest point of the path is (Ysteel=2×1011Pa)

21.

Question: A 6-kg weight is fastened to the end of a steel wire of unstreched length 60 cm. It is whirled in a vertical circle and has an angular velocity of 2 revolution per second at the bottom of the circle. The area of cross-section of the wire is 0.05cm2. The elongation of the wire when the weight is at the lowest point of the path is (Ysteel=2×1011Pa)

Answer»

Question:

A 6-kg weight is fastened to the end of a steel wire of unstreched length 60 cm. It is whirled in a vertical circle and has an angular velocity of 2 revolution per second at the bottom of the circle. The area of cross-section of the wire is 0.05cm2. The elongation of the wire when the weight is at the lowest point of the path is (Ysteel=2×1011Pa)

Discussion

22.	An object of mass m S angular acceleration=0.2rad s-2. What is the angular displacement covered by the object after 3 seconds?( assume that the object started with angle zero with zero angular velocity)
Answer» An object of mass m S angular acceleration=0.2rad s^-2. What is the angular displacement covered by the object after 3 seconds?( assume that the object started with angle zero with zero angular velocity)

Discussion

23.	During a tennis match, a player serves at 23.6 ms−1, the ball leaving the racquet horizontally 2.37 m above the court surface. By how much does the ball clear the net which is 12 m away and 0.9 m high? (answer in metres)
Answer» During a tennis match, a player serves at $23.6 {ms}^{- 1}$ , the ball leaving the racquet horizontally $2.37 m$ above the court surface. By how much does the ball clear the net which is $12 m$ away and $0.9 m$ high? (answer in metres)

Discussion

24.	Two bodies move toward each other from 10 m apart with a constant velocity they meet at C after 2s. What is the relative velocity of A w.r.t. B?
Answer» Two bodies move toward each other from 10 m apart with a constant velocity they meet at C after 2s. What is the relative velocity of A w.r.t. B?

Discussion

25.	A hot air balloon is rising with an acceleration of 10 m/s2. The moment when its velocity is 10 m/s, a stone is dropped which of the following is the displacement time graph of the stone with respect to the balloon.
Answer» A hot air balloon is rising with an acceleration of 10 $m / s^{2}$ . The moment when its velocity is 10 m/s, a stone is dropped which of the following is the displacement time graph of the stone with respect to the balloon.

Discussion

26.	A body of mass m, having momentum p is moving on a rough horizontal surface. If it is stopped in a distance x, the coefficient of friction between the body and the surface is given by μ=p2z gm2x. Then find the value of z.
Answer» A body of mass $m$ , having momentum $p$ is moving on a rough horizontal surface. If it is stopped in a distance $x$ , the coefficient of friction between the body and the surface is given by $μ = \frac{p^{2}}{z g m^{2} x}$ . Then find the value of $z$ .

Discussion

27.	Why do dry cells have high internal resistance
Answer» Why do dry cells have high internal resistance

Discussion

28.	B={ ( permeability * current ) /2πr Is this expression used for long straight current carrying wire or for infinitely long straight wire ?
Answer» B={ ( permeability * current ) /2πr Is this expression used for long straight current carrying wire or for infinitely long straight wire ?

28.

B={ ( permeability * current ) /2πr Is this expression used for long straight current carrying wire or for infinitely long straight wire ?

Answer»

B={ ( permeability * current ) /2πr

Is this expression used for long straight current carrying wire or for infinitely long straight wire ?

Discussion

29.	Imagine a light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between the planet and the star is proportional to R−52, and T2 is proportional to
Answer» Imagine a light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between the planet and the star is proportional to $R^{\frac{- 5}{2}}$ , and $T^{2}$ is proportional to

Discussion

30.	On seeing a board of speed limit, you apply brakes that brings the car from speed of 90 km/h to a speed of 72 km/h, covering a distance of 150 m at a constant acceleration. How much time is required for the given decrease in speed?
Answer» On seeing a board of speed limit, you apply brakes that brings the car from speed of $90 km/h$ to a speed of $72 km/h$ , covering a distance of $150 m$ at a constant acceleration. How much time is required for the given decrease in speed?

Discussion

31.	Three resonant frequencies of a string are 90, 150 an 210 Hz. (a) Find the highest possible funclamera frequency of vibration of this string. (b) Which harmonics of the fundamental are the given frequencies ? (c) Which overtones are these frequencies ? (d) If the length of the string is 80 cm, what would be the speed of a transverse wave on this string?
Answer» Three resonant frequencies of a string are 90, 150 an 210 Hz. (a) Find the highest possible funclamera frequency of vibration of this string. (b) Which harmonics of the fundamental are the given frequencies ? (c) Which overtones are these frequencies ? (d) If the length of the string is 80 cm, what would be the speed of a transverse wave on this string?

Discussion

32.	A solid cylinder is rolling without sliding. What fraction of its total kinetic energy is associated to rotational motion ?
Answer» A solid cylinder is rolling without sliding. What fraction of its total kinetic energy is associated to rotational motion ?

Discussion

33.	A balloon is ascending at the rate of 9.8m/s. At height of 39.2m above the ground. When a foot packet is dropped from balloon. After how much time and with what velocity does it reach the ground. (g=9.8 m/s2)
Answer» A balloon is ascending at the rate of 9.8m/s. At height of 39.2m above the ground. When a foot packet is dropped from balloon. After how much time and with what velocity does it reach the ground. ( $g = 9.8 m / s^{2}$ )

Discussion

34.	A closed hollow insulated cylinder is filled with gas at 0oC and also contains an insulated piston of negligible weight and negligible thickness at the middle point. The gas on one side is heated to 100oC. If the piston moves through 5 cm, the length of the hollow cylinder is
Answer» A closed hollow insulated cylinder is filled with gas at $0^{o} C$ and also contains an insulated piston of negligible weight and negligible thickness at the middle point. The gas on one side is heated to $100^{o} C$ . If the piston moves through 5 cm, the length of the hollow cylinder is

Discussion

35.	What is the difference between magnitude of vector R and resultant of 2 different vectors R->
Answer» What is the difference between magnitude of vector R and resultant of 2 different vectors R->

Discussion

36.	A machine gun fires a bullet of mass of 65 g with a velocity of 1300 m/s. The man holding it can exert a maximum force of 169 N on the gun. What will be the number of bullets he can fire per second?
Answer» A machine gun fires a bullet of mass of 65 g with a velocity of 1300 m/s. The man holding it can exert a maximum force of 169 N on the gun. What will be the number of bullets he can fire per second?

Discussion

37.	Why proton is always positive charge
Answer» Why proton is always positive charge

Discussion

38.	A particle is moving on a circle of radius 1 km with constant speed 10π m/s. Find the change in velocity vector of particle in a time duration of 1 second. (in m/s)
Answer» A particle is moving on a circle of radius 1 km with constant speed 10π m/s. Find the change in velocity vector of particle in a time duration of 1 second. (in m/s)

Discussion

39.	An aircraft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15∘. What is the radius of the loop? (take tan15∘=0.27) and g=10 ms−2
Answer» An aircraft executes a horizontal loop at a speed of $720 k m / h$ with its wings banked at $15^{\circ}$ . What is the radius of the loop? (take $t a n 15^{\circ} = 0.27$ ) and $g = 10 m s^{- 2}$

Discussion

40.	A car leaves station X for station Y every 10 min. The distance between X and Y is 60 km. The car travels at speed 60 km/h. A man drives a car from Y towards X at speed 60 km/h. If he starts at the moment when first car leaves station X, how many cars would he meet on route?
Answer» A car leaves station $X$ for station $Y$ every 10 min. The distance between $X$ and $Y$ is $60 km$ . The car travels at speed $60 km/h$ . A man drives a car from $Y$ towards $X$ at speed $60 km/h$ . If he starts at the moment when first car leaves station $X$ , how many cars would he meet on route?

Discussion

41.	In the above problem, if thelift moves up with a constant velocity of 2 m/sec, the reading on the balance will Be
Answer» In the above problem, if thelift moves up with a constant velocity of 2 m/sec, the reading on the balance will Be

Discussion

42.	The average kinetic energy of a molecule in an ideal gas is
Answer» The average kinetic energy of a molecule in an ideal gas is

Discussion

43.	Two coils have self-inductances L1 = 8mH and L2 = 4mH. The current in one coil is increased at a constant rate. The current in the second coil is also increased at the same constant rate. At a certain instant of time, the current, the induced voltage and the energy stored in the first coil are i1, V1 and W1. Corresponding values for the second coil are i2, V2 and W2 respectively. Then: (IIT-JEE 1994)
Answer» Two coils have self-inductances $L_{1} = 8 m H$ and $L_{2} = 4 m H$ . The current in one coil is increased at a constant rate. The current in the second coil is also increased at the same constant rate. At a certain instant of time, the current, the induced voltage and the energy stored in the first coil are $i_{1}, V_{1}$ and $W_{1}$ . Corresponding values for the second coil are $i_{2}, V_{2}$ and $W_{2}$ respectively. Then: (IIT-JEE 1994)

Discussion

44.	A person travels along a straight road for half the distance with velocity v1 and the remaining half distance with velocity v2 The average velocity is given by
Answer» A person travels along a straight road for half the distance with velocity $v_{1}$ and the remaining half distance with velocity $v_{2}$ The average velocity is given by

44.

A person travels along a straight road for half the distance with velocity v1 and the remaining half distance with velocity v2 The average velocity is given by

Answer»

A person travels along a straight road for half the distance with velocity $v_{1}$ and the remaining half distance with velocity $v_{2}$ The average velocity is given by

Discussion

45.	A motorcycle is going on an overbridge of radius R. The driver maintains a constant speed. As the motorcycle is ascending on the overbridge, the normal force on it
Answer» A motorcycle is going on an overbridge of radius R. The driver maintains a constant speed. As the motorcycle is ascending on the overbridge, the normal force on it

Discussion

46.	The half-life of a radioisotope is 10 h. Find the total number of disintegrations in the tenth hour measured from a time when the activity was 1 Ci.
Answer» The half-life of a radioisotope is 10 h. Find the total number of disintegrations in the tenth hour measured from a time when the activity was 1 Ci.

Discussion

47.	If →A=6^i−15^j and →B=−3^i+11^j, the magnitude and direction of →A+→B is
Answer» If $\to A = 6^i - 15^j$ and $\to B = - 3^i + 11^j$ , the magnitude and direction of $\to A + \to B$ is

Discussion

48.	A body starts from rest and moving with an acceleration 2 ms–2. The velocity of the body when it covers a distance of 10 m (in ms–1) is
Answer» A body starts from rest and moving with an acceleration $2 {ms}^{- 2}$ . The velocity of the body when it covers a distance of $10 m$ (in ${ms}^{- 1}$ ) is

Discussion

49.	A projectile is thrown horizontally with a speed of 20 m s−1. If g is 10 ms−2, then the speed of the projectile after 5 seconds will be nearly
Answer» A projectile is thrown horizontally with a speed of $20 {m s}^{- 1}$ . If $g$ is $10 {ms}^{- 2}$ , then the speed of the projectile after $5$ seconds will be nearly

Discussion

50.	The S.I. unit of electric flux is
Answer» The S.I. unit of electric flux is

50.

The S.I. unit of electric flux is

Answer»

The S.I. unit of electric flux is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A laser beam is used for carrying out surgery, because it

If the time period (T) of vibrations of a liquid drop depends on the surface tension (S) of the fluid over which it is kept, radius (r) of the drop and density (ρ) of the liquid then the equation of T is [here, k is a dimensionless proportionality constant]

A ball of mass 1 kg is attached to an inextensible string. The ball is released from the position shown in figure. Find the magnitude of impulse imparted by the string to the ball immediately after the string becomes taut. Take g=10 m/s2.

A solid sphere of mass 1 kg and radius 10 cm rolls down an inclined plane of height 7 m. The velocity of its center as it reaches the ground level is

Two paper screens A and B are separated by 150 m. A bullet pierces A and B such that hole in B is h=15 cm below the hole in A. If the bullet is travelling horizontally at the time of hitting A, then the velocity of bullet at A is

A loaded truck travels 14 km in 25 minutes. If the speed remains the same, how far can it travel in 5 hours? [2 MARKS]

Why is rms velocity and not average velocity considered in case of gases?

Show that, of all the rectangles inscribed in a given circle, the square has the maximum area.

Two masses 2 kg and 3 kg are attached to the end of the string passed over a frictionless pulley fixed at the the top. The tension in the string and acceleration of the masses are

15 J of heat is added to a monoatomic ideal gas in a process in which the gas performs a work of 5 J on its surroundings . Find the molar heat capacity of the gas during the process.

A body falls from rest under gravity and travels half of its total path in the last second. Find the time of fall in seconds. (Take g=10 ms−2)

A wire stretched between two rigid supports vibrates in its fundamental mode with a frequency of 45 Hz. The mass of the wire is 3.5×10−2 kg and its linear density is 4.0×10−2 kg m−1. What is the tension in the string?

A particle of mass m starts moving in a circular path A of constant radius r in such a way that its centripetal acceleration ac is changing with time as ac=k2r2t2 where k is a constant. What is the power delivered to the particle by the force acting on it?

If surface area of a cube is changing at a rate of 6 m2/s , find the rate at which length of the body diagonal changes, at a moment when side length is 1 m.

A body is projected with a velocity of 40ms-1.After 2s,it crosses a vertical pole of length 20 calculate the angel of projection and horizontal range, g=10 ms-2

Two photons having

If two quantities have same dimensions, do they represent the same physical content?

Three equal weights of mass 2 kg each are hanging by a string passing over a fixed pulley. The tension in the string (in N) connecting B and C is

A positive charge q exerts a force of magnitude - 0.2 N on another charge, which has a magnitude twice as the other charge. Find the magnitude of each charge if the distance separating them is equal to 50 cm. (Ans = 1.66 × 10-6 C)

An object of mass m S angular acceleration=0.2rad s-2. What is the angular displacement covered by the object after 3 seconds?( assume that the object started with angle zero with zero angular velocity)

During a tennis match, a player serves at 23.6 ms−1, the ball leaving the racquet horizontally 2.37 m above the court surface. By how much does the ball clear the net which is 12 m away and 0.9 m high? (answer in metres)

Two bodies move toward each other from 10 m apart with a constant velocity they meet at C after 2s. What is the relative velocity of A w.r.t. B?

A hot air balloon is rising with an acceleration of 10 m/s2. The moment when its velocity is 10 m/s, a stone is dropped which of the following is the displacement time graph of the stone with respect to the balloon.

A body of mass m, having momentum p is moving on a rough horizontal surface. If it is stopped in a distance x, the coefficient of friction between the body and the surface is given by μ=p2z gm2x. Then find the value of z.

Why do dry cells have high internal resistance

B={ ( permeability * current ) /2πr Is this expression used for long straight current carrying wire or for infinitely long straight wire ?

Imagine a light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between the planet and the star is proportional to R−52, and T2 is proportional to

On seeing a board of speed limit, you apply brakes that brings the car from speed of 90 km/h to a speed of 72 km/h, covering a distance of 150 m at a constant acceleration. How much time is required for the given decrease in speed?

A solid cylinder is rolling without sliding. What fraction of its total kinetic energy is associated to rotational motion ?

A balloon is ascending at the rate of 9.8m/s. At height of 39.2m above the ground. When a foot packet is dropped from balloon. After how much time and with what velocity does it reach the ground. (g=9.8 m/s2)

A closed hollow insulated cylinder is filled with gas at 0oC and also contains an insulated piston of negligible weight and negligible thickness at the middle point. The gas on one side is heated to 100oC. If the piston moves through 5 cm, the length of the hollow cylinder is

What is the difference between magnitude of vector R and resultant of 2 different vectors R-&gt;

A machine gun fires a bullet of mass of 65 g with a velocity of 1300 m/s. The man holding it can exert a maximum force of 169 N on the gun. What will be the number of bullets he can fire per second?

Why proton is always positive charge

A particle is moving on a circle of radius 1 km with constant speed 10π m/s. Find the change in velocity vector of particle in a time duration of 1 second. (in m/s)

An aircraft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15∘. What is the radius of the loop? (take tan15∘=0.27) and g=10 ms−2

A car leaves station X for station Y every 10 min. The distance between X and Y is 60 km. The car travels at speed 60 km/h. A man drives a car from Y towards X at speed 60 km/h. If he starts at the moment when first car leaves station X, how many cars would he meet on route?

In the above problem, if thelift moves up with a constant velocity of 2 m/sec, the reading on the balance will Be

The average kinetic energy of a molecule in an ideal gas is

A person travels along a straight road for half the distance with velocity v1 and the remaining half distance with velocity v2 The average velocity is given by

A motorcycle is going on an overbridge of radius R. The driver maintains a constant speed. As the motorcycle is ascending on the overbridge, the normal force on it

The half-life of a radioisotope is 10 h. Find the total number of disintegrations in the tenth hour measured from a time when the activity was 1 Ci.

If →A=6^i−15^j and →B=−3^i+11^j, the magnitude and direction of →A+→B is

A body starts from rest and moving with an acceleration 2 ms–2. The velocity of the body when it covers a distance of 10 m (in ms–1) is

A projectile is thrown horizontally with a speed of 20 m s−1. If g is 10 ms−2, then the speed of the projectile after 5 seconds will be nearly

The S.I. unit of electric flux is

What is the difference between magnitude of vector R and resultant of 2 different vectors R->