A particle moves in a circular orbit under the action of a central ...

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A particle moves in a circular orbit under the action of a central attractive force inversely proportional to the distance ' \( r \) '. The speed of the particle is
(a) proportional to \( \mathrm{r}^{2} \)
(b) independent of \( r \)
(c) proportional to \( r \)
(d) proportional to \( 1 / \mathrm{r} \)
\( \mathrm{P} \)
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