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This tag is for questions relating to collision which is the interaction between two or more bodies that results in physical contact and an exchange of momentum between the bodies involved. When it happens, kinetic energy is often exchanged between the molecules’ translational motion and their internal degrees of freedom.

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Is kinetic energy always lost in an inelastic collision?

Does this imply that kinetic energy is sometimes conserved in an inelastic collision? As far as I know I haven't ever heard of such a situation. Is it possible? … Also what then should be the perfect definition for an inelastic collision? …
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