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Question

A body of mass 10 kg moving with velocity of 10 m/s hits another body of mass 30  kg moving with velocity 3 m/s in same direction. The co-efficient of restitution is 14. The velocity of centre of mass after collision will be
  1. 20 m/s
  2. 40 m/s
  3. 194m/s
  4. 234m/s


Solution

The correct option is C 194m/s
Before collision, vcm=(10)(10)+(30)(3)10+30=194m/s
Since no external force acts on system, velocity of centre of mass remains constant.
The correct option is (C)

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