System is shown in the figure and man is pulling the rope from both sides with constant speed \...

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System is shown in the figure and man is pulling the rope from both sides with constant speed \( u \) . Then the speed of the block will be ( \( M \) moves vertical):
(a) \( \frac{3 u}{4} \)
(b) \( \frac{3 u}{2} \)
(c) \( \frac{u}{4} \)
(d) None of these
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