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

A body of mass m is rotating in a verticle circle of diameter '2r' with critical speed. The difference in its kinetic energy at the highest and lowest points on the verticle circle is

A

mg r

B

3 mgr

C

2 mgr

D

4 mgr

Text Solution

Verified by Experts

The correct Answer is:

C

D Kinetic energy =D Potential energy
ngh
=`mg(2r)=2mgh`.

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