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A bus starting from rest moves with a uniform acceleration of 0.1 m/s for 2 minutes. Find (i) the speed acquired, (ii) the distance travelled. |
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Answer» rong><U>Answer : ➥ The Speed acquired by a bus = 12 m/s ➥ The Distance TRAVELLED by a bus = 720 m Given :➤ Intial velocity of a bus = 0 m/s ➤ Acceleration of a bus = 0.1 m/s² ➤ Time required by the bus = 2 min To Find :➤ Speed required by a bus = ? ➤ Distance travelled by a bus = ? Required Solution :According to the given question given that Initial velocity of a bus is 0 m/s because the bus STARTING from rest, acceleration is 0.1 m/s² and Time taken by a bus is 2 min. ✒ To find the Speed acuired by a bus and Distance travelled by a bus, first we need to convert the time taken by a bus, minute into second, after that we will find the Speed acuiredquired by a bus and Distance travelled by a bus. ◈ Time taken = 2 min → Time taken = 2 × 60 → Time taken = 120 sec Now, we have Intial velocity, Acceleration, and Time taken by a bus.
We can find Final velocity of a bus by using the first equation of motion which says v = u + at. Here,
✎ So let's calculate Final velocity (v) ! ⇛ v = u + at ⇛ v = 0 + 0.1 × 120 ⇛ v = 0 + 12 ⇛ v = 12 m/s ║Hence, Speed acquired by a bus is 12 m/s.║ We can find Distance travelled by a bus by using the second equation of motion which says s = ut + ½ at². Here,
✎ So let's find Distance travelled (s) ! ⇛ s = ut + ½ at² ⇛ s = 0 × 120 + ½ × 0.1 × 120² ⇛ s = 0 + ½ × 0.1 × 120² ⇛ s = 0 + ½ × 0.1 × 14400 ⇛ s = 0 + 1 × 0.1 × 7200 ⇛ s = 0 + 1 × 720 ⇛ s = 0 + 720 ⇛ s = 720 m ║Hence, the Distance travelled by bus is 720 m.║ |
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