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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

`2u cos theta`

B

`u//cos theta`

C

`2u//cos theta`

D

`u cos theta`

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The correct Answer is:
B
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