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Total distance traveled by bike is 25m a...

Total distance traveled by bike is 25m and Total time is taken to travel distance is 10 second then find average speed.

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The correct Answer is:
B
In the semicircle, we can consider a small element `dtheta`
then mass of `R/dtheta=(M/L)Rdtheta`
dF=(Gmrdthetam)/(LR^2)`
dF_1=2dF`
`since =(2GMm)/(LR) sintheta d theta `:. F=int_0^(pi/2) (-2GMm)/(LR) sintheta d theta`
=(-2GMm)/(LR) (-1)`
`(2GMm)/(LR)=(2GMm)/(LL/pi)`
=(2piGMm)/L^2`
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