First slide
Collisions
Question

A sphere of mass m moving with a constant velocity u hits another stationary sphere of the same mass. If e is the coefficient of restitution, then the ratio of the velocity of two spheres after collision will be 

Moderate
Solution

v1=m1-em2m1+m2u1=1-e2u v2=1+em1m1+m2u1=1+e2u

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