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Published on Mar 13, 2009
In the case of equal mass collisions, the two objects just exchange velocities. If the initial velocity of one of the balls were zero, then the one colliding with it would just stop and the hit ball would take off at the original speed of the incoming ball.
If the mass of incoming ball is greater than the mass of the still one, then after collision both velocities will be positive and the balls will move in one direction, which coincides with the direction of initial motion of incoming ball.
If the mass of incoming ball is smaller than the mass of the still one, then after collision the balls will move in opposite directions.