Conservation of Momentum in Elastic Collisions

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The discussion centers on the application of the conservation of momentum principle in elastic collisions, specifically involving two balls with differing masses. When a ball of mass m1 collides with a ball of mass m2 (20 times m1), and m1 rebounds with a velocity of -v1, the velocity of m2 can be calculated as v2 = v1/10, assuming both balls move along the same line post-collision. The initial velocity of m2 is zero before impact, emphasizing the importance of direction in momentum calculations.

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Mr JF
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If a ball has a mass of m1 and a velocity of v1, and collides with a second ball with a mass of 20 times m1 (m2=20xm1) and m1 rebound with a velocity of –v1 and is the velocity of m2?
and m2 velocity is 0 before impact
 
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Just use conservation of momentum. Be careful of one thing - are you assuming that the directions after collision are along the same line as that before? Otherwise the problem statement is incomplete. If along line, then v2=v1/10.
 

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