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A particle of mass \( m \) describes a circle of radius \( (r) \). The centripetal acceleration of the particle is \( \frac{4}{r^{2}} \). The momentum of the particle is
(a) \( \frac{2 m}{r} \)
(b) \( \frac{2 m}{\sqrt{r}} \)
(c) \( \frac{4 m}{r} \)
(d) \( \frac{4 m}{\sqrt{r}} \)
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