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A weight W is tied to two strings passin...

A weight W is tied to two strings passing over tha frictionless pulleys A and B as shown in the figure. If weights P and Q move downwards with speed v, the weight W at any instant rises with the speed `:`

A

`v cos theta`

B

`2v cos theta`

C

`v //cos theta`

D

` 2 v //cos theta `

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