$A$ bullet of mass $m$ moving with velocity $v$ strikes a suspended wooden block of mass $M$. If the block rises to a height $h$,the initial velocity of the block immediately after the collision will be

  • A
    $\sqrt{2gh}$
  • B
    $\frac{M+m}{m}\sqrt{2gh}$
  • C
    $\frac{m}{M+m}2gh$
  • D
    $\frac{M+m}{M}\sqrt{2gh}$

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