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 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 block 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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