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If a particle of mass m is moving in a h...

If a particle of mass m is moving in a horizontal circle of radius r with a centripetal force ` (-1//r^(2))` , the total energy is

A

`-k/(2r)`

B

`-k/(r)`

C

`-(2k)/(r)`

D

`-(4k)/(r)`

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The correct Answer is:
A
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