In arrangement shown in fig. ends P and Q of an unstretchable string move downwards with uniform spe

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4-1.Newton's Laws of Motion

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In the arrangement shown in 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$2\,U \cos \theta$

B$U \cos \theta$

C$\frac{U}{\cos \theta}$

D$\frac{2U}{\cos \theta}$

Solution

From constrained
$v \cos \theta= u$
$v=\frac{u}{\cos \theta}$

Standard 11

Physics

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