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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 the collision of billiard balls in vacuum elastic or inelastic?
But if that part is negligible compared to total energy of the balls, you can assume that collision is elastic. …