In the fig., the ends \( \mathrm{P} \) and \( \mathrm{Q} \) of an u...

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In the fig., the ends \( \mathrm{P} \) and \( \mathrm{Q} \) of an unstrechable string move downward with uniform speed \( v \). Mass \( M \)
\( \mathrm{P} \) moves upwards with speed.

W
(1) \( v \cos \theta \)
(2) \( v / \cos \theta \)
(3) \( 2 v \cos \theta \)
(4) \( 2 / v \cos \theta \)
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