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![[Post New]](/templates/default/images/icon_minipost_new.gif) 22 May 2007 17:02:19 IST
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Consider a particle colliding with a wall. You can resolve the approach velocity perpendicular to the wall and parallel to it. The component parallel to the wall remains the same even after the collision. The component perpendicular to the wall reverses its direction and its magnitude becomes e times the previous value.
Apply this analogy to all problems. If instead of a ball you have atwo balls, the component of approach velocity along the line joining them changes e times.
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