A big ball of mass $M$, moving with velocity $u$ strikes a small ball of mass $m$, which is at rest. Finally small ball obtains velocity $u$ and big ball $v$. Then what is the value of $v$
A big ball of mass $M$, moving with velocity $u$ strikes a small ball of mass $m$, which is at rest. Finally small ball obtains velocity $u$ and big ball $v$. Then what is the value of $v$
- A
$\frac{{M - m}}{{M }}u$
- B
$\frac{m}{{M + m}}u$
- C
$\frac{{2m}}{{M + m}}u$
- D
$\frac{M}{{M + m}}u$
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