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In the arrangement shown in the Fig, the...

In the arrangement shown in the Fig, 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

A

`2Ucostheta`

B

`Ucostheta`

C

`(2U)/(costheta)`

D

`(U)/(costheta)`

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The correct Answer is:
D
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