A particle of mass 4kg moving with a speed of 10m s collides with a train moving in an opposite direction with a speed of 20m s

Question

A particle of mass 4kg moving with a speed of 10m s collides with a train moving in an opposite direction with a speed of 20m s If coefficient of calculate the final speed of the restitution e e 2 2 particle in m s 1 5 3 20 2 15 4 35

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