In the arrangement shown in fig. the ends \( P \) and \( Q \) of an...

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In the arrangement shown in fig. the ends \( P \) and \( Q \) of an unstretchable string move downwards with uniform speed
\( \mathrm{P} \) U. Pulleys A and B are fixed. Mass M moves upwards

W with a speed.
(a) \( 2 \mathrm{U} \cos \theta \)
(b) \( \mathrm{U} \cos \theta \)
(c) \( \frac{2 \mathrm{U}}{\cos \theta} \)
(d) \( \frac{\mathrm{U}}{\cos \theta} \)
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