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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

`(9)/(2)` mgr

B

6 mgr

C

4 mgr

D

2 mgr

Text Solution

Verified by Experts

The correct Answer is:
D
By energy conservation, `KE_("bottom")-KE_("top")=PE_("top")-PE_("bottom")`
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