A body of mass 2kg starts from rest and moves with uniform acceleratio

1.	A body of mass 2kg starts from rest and moves with uniform acceleration. It acquires a velocity of 20m/s in 4 seconds. The power exerted on the body in 2 seconds is(1) 50watts(2) 100watts(3) 150watts(4) 200watts
Answer» Answer: 200 watts.. Explanation: M=2 kg u= o m/s v= 20 m/s t= 4 s so, acceleration = (v-u)/t = 20/4 = 5 m/s^2 therefore, FORCE= 2×5=10 N s= 1/2 at^2 = 1/2×5×16 = 40 m so, work = force×displacement = 10×40 = 400 j therefore, power = work /TIME = 400/2 = 200 watt hope ITT helps.. :))

A body of mass 2kg starts from rest and moves with uniform acceleration. It acquires a velocity of 20m/s in 4 seconds. The power exerted on the body in 2 seconds is(1) 50watts(2) 100watts(3) 150watts(4) 200watts

Answer»

Answer:

200 watts..

Explanation:

M=2 kg

u= o m/s

v= 20 m/s

t= 4 s

so, acceleration = (v-u)/t

= 20/4

= 5 m/s^2

therefore, FORCE= 2×5=10 N

s= 1/2 at^2

= 1/2×5×16

= 40 m

so, work = force×displacement

= 10×40

= 400 j

therefore, power = work /TIME

= 400/2

= 200 watt

hope ITT helps..

:))

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A body of mass 2kg starts from rest and moves with uniform acceleration. It acquires a velocity of 20m/s in 4 seconds. The power exerted on the body in 2 seconds is(1) 50watts(2) 100watts(3) 150watts(4) 200watts

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