Question

if a person moving along a circlar path of radius 10km and he complete a circle in 20minutes then his displacement at the end of the 1hr 10 minutes
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Answer 1

Answer:

As the average acceleration is change in velocity over the time taken,

In this case when the half revolution is over the direction in the speed changes by 180 degrees,

so the change in velocity =5−(−5)=10 m/s

The time taken to cover this distance =5π∗r=55π=π (as the distance travelled is semicircle)

So, average acceleration =π10ms−2

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