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