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In the arrangement shown in figure the e...

In the arrangement shown in figure the ends P and Q of an inextensible string move downwards with uniform speed u. Pulleys A and B are fixed. The mass M moves upwards with a speed

A

`2 u cos theta`

B

`u//cos theta`

C

`2 u // cos theta`

D

`u cos theta`

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The correct Answer is:
B
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