A particle of mass $m$ with an initial velocity $u\hat i$ collides perfectly elastically with a mass $3m$ at rest. It moves with a velocity $v\hat j$ after collision, then, $v$ is given by
A particle of mass $m$ with an initial velocity $u\hat i$ collides perfectly elastically with a mass $3m$ at rest. It moves with a velocity $v\hat j$ after collision, then, $v$ is given by
- [JEE MAIN 2020]
- A
$v=\sqrt{\frac{2}{3}} u$
- B
$v =\frac{1}{\sqrt{6}} u$
- C
$v=\frac{u}{\sqrt{3}}$
- D
$v=\frac{u}{\sqrt{2}}$
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- [IIT 2013]
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- [JEE MAIN 2021]
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- [NEET 2018]