Question

9) A boy moving along a circular path radius 10m complete 3-4 of the circle in 10s the magnitude of a speed and velocity are
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Answer 1

Here,

We are given that the boy completes34th of the circle.

Thus,

The distance travelled by the boy,sd=34×2π(10)

Further, we get

sd=15π

Then, we get

sd=47.12m

Now,

The time of travel,t=10s

Thus,

Speed of the body,vs=47.1210

Further, we get

vs=4.71ms−1

Now,

The displacement of the boy,s=102–√m

Further, we get

s=14.14m

Thus,

The velocity of the boy,v=14.110

Hence,

v=1.41ms−1