Problem

Problem

A simple pendulum is released from rest with the string in horizontal position. The vertical component of the velocity of the bob becomes maximum, when the string makes an angle θ\theta with the vertical. The angle θ\theta is equal to a. π4\frac{\pi}{4} b. cos⁡−1(13)\cos^{-1}\left(\frac{1}{\sqrt{3}}\right) c. sin⁡−1(13)\sin^{-1}\left(\frac{1}{\sqrt{3}}\right) d. π3\frac{\pi}{3}

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