A ball of mass $2\,m$ is moving with velocity $v$ on a smooth surface collides elastically headon with another ball of mass $m$. If ball of mass $m$ reaches upto top of frictionless elevated plane, then velocity $v$ of heavy ball must be
A ball of mass $2\,m$ is moving with velocity $v$ on a smooth surface collides elastically headon with another ball of mass $m$. If ball of mass $m$ reaches upto top of frictionless elevated plane, then velocity $v$ of heavy ball must be
- A
$\sqrt {\frac{3}{2}\,gh} \,$
- B
$\sqrt {\frac{{2gh}}{3}} $
- C
$\sqrt {\frac{{8gh}}{9}} $
- D
$\sqrt {\frac{{9gh}}{8}} $
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