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 bullet will be
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 bullet will be
- A
$\sqrt {2gh} $
- B
$\frac{{(M + m)}}{m}\sqrt {2gh} $
- C
$\frac{m}{{(M + m)}}\sqrt {2gh} $
- D
$\frac{{(M - m)}}{m}\sqrt {2gh} $
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