A ball X of mass 1 kg travelling at 2 m/s has a head-on collision with an identical ball Y at rest. X stops and Y moves off. Calculate the velocity of Y after the collision.

Mass of ball X, m1 = 1 kg

Mass of ball Y, m2 = 1kg


According to conservation of momentum,


m1u1 + m2u2 = m1v1 + m2v2


1*2 + 1*0 = 1*0 + 1*v2


2 + 0 = 0 + v2


v2 = 2 m/s


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