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NEET2023PhysicsCenter of Mass, Momentum and CollisionActual

Two particles A and B initially at rest, move towards each other under mutual force of attraction. At an instance when the speed of A is v and speed of B is 3 v , the speed of centre of mass is

Options

  1. Av
  2. B4 v
  3. C2 v
  4. DZero

Correct answer

D. Zero

Step-by-step solution

Only internal force is acting on the system. Therefore F _ ext =0 . It is also given that the initial velocity of COM is zero, therefore it will remain at rest.

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