An object of mass m 1 collides with another object of mass m 2 , which is at rest. After the collision the objects move with equal speeds in opposite direction. The ratio of the masses m 2 : m 1 is :

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m 1 v 1 = - m 1 v + m 2 v v 1 = - v + m 2 m 1 v v 1 + v v = m 2 m 1 e = 2 v v 1 = 1 v = v 1 2 v 1 + v 1 / 2 v 1 / 2 = m 2 m 1 3 = m 2 m 1

Physics - Center of Mass Question with Solution | TestHub

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