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A body of mass m is moving in a circle o...

A body of mass m is moving in a circle of radius r with a constant speed v, The force on the body is `(mv^(2))/(r )` and is directed towards the centre what is the work done by the from in moving the body over half the circumference of the circle?

A

`(mv^(2))/r xxpir`

B

zero

C

`(mv^(2))/(r^(2))`

D

`(pir^(2))/(mv^(2))`

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The correct Answer is:
B
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