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A particle of mass m is moving with velo...

A particle of mass m is moving with velocity v in horizontal circle under a centripetal force `(-k)/(r^(2))`. What is total energy of the particle if r is radius ?

A

`(-k)/(r )`

B

`(k)/(r )`

C

`(-k)/(2r)`

D

`(-k)/(r^(2))`

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