A body is mass m is rotating in a vertic...

A body is mass `m` is rotating in a vertical circle of radius 'r' with critical speed. The difference in its `K.E` at the top and at the bottom is

A

`(mg)/(r)`

B

`(2mg)/(r)`

C

`2mgr`

D

`mgr`

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The correct Answer is:

C

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