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In the arrangement shown in figure, the ...

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

`2ucostheta`

B

`u/(cos theta)`

C

`(2u)/(costheta)`

D

`u cos theta`

Text Solution

Verified by Experts

(b) Here `(dx)/(dt)=u`
Form figure `l^(2)=y^(2)=x^(2)`

`2y(dy)/(dx)=2d(dy)/(dx)` or `(dy)/(dt)u = u/(cos theta)` ( `:'y/x=cos theta`)'
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