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

534-12

  • [IIT 1982]
  • A

    $2U\cos \theta $

  • B

    $U\cos \theta $

  • C

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

  • D

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

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