A bob of mass \( M \) is suspended by a massless string of length \( L \). The horizontal veloci...

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A bob of mass \( M \) is suspended by a massless string of length \( L \). The horizontal velocity \( V \) at position \( A \) is just sufficient to make it reach the point \( B \). The angle \( \theta \) at which the speed of the bob is half of that at \( A \), satisfies
(a) \( \theta=\frac{\pi}{4} \)
(b) \( \frac{\pi}{4}\theta\frac{\pi}{2} \)
(c) \( \frac{\pi}{2}\theta\frac{3 \pi}{4} \)
(d) \( \frac{3 \pi}{4}\theta\pi \)
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