Center of MassHard

Question

Ball 1 collides head on with an another identical ball 2 at rest. Velocity of second ball after collision becomes two times that of 1 after collision. The coefficient of restitution between the two balls is :   

Options

A.e = 1/3
B.e = 1/2
C.e = 1/4
D.e = 2/3

Solution

v2 = 2v1
(1 + e) u1 = 2(1 − e)u1
e = 1/3

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