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A simple pendulum of bob of mass \( m \) and length
\( \mathrm{L} \) has one of its ends fixed at the centre \( \mathrm{O} \) of a
P vertical circle, as shown in the figure. If \( \theta=60^{\circ} \)

W at the point \( \mathrm{P} \), the minimum speed \( \mathrm{u} \) that should be given to the bob so that it completes vertical circle is
(1) \( \sqrt{g L} \)
(2) \( \sqrt{2 \mathrm{gL}} \)
(3) \( \sqrt{\frac{5 g L}{2}} \)
(4) \( \sqrt{\frac{3 g L}{2}} \)
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