In the arrangement shown in figure 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 figure 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
- [IIT 1982]
- A
$2U\cos \theta $
- B
$U\cos \theta $
- C
$\frac{{2U}}{{\cos \theta }}$
- D
$\frac{U}{{\cos \theta }}$
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