A particle of mass $m $ is moving in a horizontal circle of radius $r$ under a centripetal force equal to $ - K/{r^2}$, where $K$ is a constant. The total energy of the particle is
A particle of mass $m $ is moving in a horizontal circle of radius $r$ under a centripetal force equal to $ - K/{r^2}$, where $K$ is a constant. The total energy of the particle is
- [IIT 1977]
- A
$\frac{K}{{2r}}$
- B
$ - \frac{K}{{2r}}$
- C
$ - \frac{K}{r}$
- D
$\frac{K}{r}$
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