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A body of mass m is revolving along a ve...

A body of mass m is revolving along a vertical circle of radius r such that the sum of its kinetic energy and potential energy is constant. If the speed of the body at the highest point is `sqrt (2rg)` then the speed of the body at the lowest point is

A

`sqrt (4gr)`

B

`sqrt (6gr)`

C

`sqrt (2gr)`

D

`sqrt (gr)`

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