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Meaning of elastic collision

elas'tic colli'sion

Pronunciation: [key]
— Mech. Mech.
  1. a collision in which the total kinetic energy of the colliding bodies or particles is the same after the collision as it was before (opposed to inelastic collision).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.