In the arrangement shown in figure the ends \(P\) and \(Q\) of an unstretchable string move down....

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