A ball of mass m 1 is moving with velocity 3 v . It collides head on elastically with a stationary ball of…

A ball of mass m1 is moving with velocity 3v. It collides head on elastically with a stationary ball of mass m2. The velocity of both the balls become v after collision. Then the value of the ratio m2m1 is
  1. 1
  2. 2
  3. 3
  4. 4

Solution

3m1v=m1v+m2v

3m1v-m1v=m2v

2m1v=m2v

∴ m2m1=2

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