Two particles of masses m and 3 m approach each other with different velocities. After collision, the…

Two particles of masses m and 3m 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 3m in the centre of mass frame is
  1. -2v→
  2. -v→2
  3. -v→3
  4. -v→4

Solution

 

In the centre of mass frame, the total linear momentum of the  system is zero.

Hence, mv→+3mv→'=0

or v→'=-v→3

 

 

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