\( k / r^{2} \) represents the force under which a particle is moving in a circle of radius \( r...

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\( k / r^{2} \) represents the force under which a particle is moving in a circle of radius \( r \). The total energy of the particle is
(a) \( \frac{k}{2 r} \)
(b) \( \frac{2 k}{r} \)
(c) \( \frac{-k}{r} \)
(d) \( -\frac{k}{2 r} \)
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