In the arrangement shown in the figure, the ends P and Q of an un stretchable string move downwards

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In the arrangement shown in the figure, the ends P and Q of an un stretchable string move downwards with uniform speed U. Pulleys A and B are fixed. The mass M moves upwards with a speed:
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My series questions is why 2ucos theta is wrong method?

meeravalisk
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Why is the 2ucos theta wala method wrong?

PadhleReet