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Center of Mass question

2020 · 2 Sep · Shift 1 · Q42
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Center of Mass question

2020 · 2 Sep · Shift 1 · Q42

JEE MainPhysicsCenter of MassMCQ+4 / −1
A particle of mass m with an initial velocity ui^u\widehat iui collides perfectly elastically with a mass 3 m at rest. It moves with a velocity vj^v\widehat jvj​ after collision, then, v is given by :
  1. A
    v=23uv = \sqrt {{2 \over 3}} uv=32​​u
  2. B
    v=u3v = {u \over {\sqrt 3 }}v=3​u​
  3. C
    v=u2v = {u \over {\sqrt 2 }}v=2​u​
  4. D
    v=16uv = {1 \over {\sqrt 6 }}uv=6​1​u
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