A particle of mass \( m \) is fixed to one end of a light rigid rod of length \( l \) and rotate....

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A particle of mass \( m \) is fixed to one end of a light
\( \mathrm{P} \)
rigid rod of length \( l \) and rotated in a vertical circular path about its other end. The minimum speed of the particle at its highest point must be
(A) Zero
(B) \( \sqrt{g l} \)
(C) \( \sqrt{1.5 g l} \)
(D) \( \sqrt{2 g l} \)


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