What is the minimum velocity with which a body of mass \( m \) must...

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What is the minimum velocity with which a body of mass \( m \) must enter a vertical loop of radius \( R \) so that
\( \mathrm{P} \) it can complete the loop?

W
(a) \( \sqrt{3 g R} \)
(b) \( \sqrt{5 g R} \)
(c) \( \sqrt{g R} \)
(d) \( \sqrt{2 g R} \)
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