A body of mass m moving with velocity v collides elastically head on with another body of mass 2m which is initially at rest The

Question

A body of mass m moving with velocity v collides elastically head on with another body of mass 2m which is initially at rest The ratio of kinetic energy of colliding body before and after collision is 1 3 1 2 4 1 3 9 8 4 91

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