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NTA Abhyas JEE Main2020PhysicsCenter of Mass, Momentum and CollisionPractice

Two particles of masses m and 3 m approach each other with different velocities. After collision, the particle of mass m has velocity v → in their centre of mass frame. Velocity of particle of mass 3 m in the centre of mass frame is

Options

  1. A- 2 v →
  2. B- v → 2
  3. C- v → 3
  4. D- v → 4

Correct answer

C. - v → 3

Step-by-step solution

In the centre of mass frame, the total linear momentum of the system is zero. Hence, m v → + 3 m v → ' = 0 or v → ' = - v → 3

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