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> Yes. I was saying, in a theoretical context, people often assume that
> objects collide with no deformation, but presumably in the real world this
> never actually happens...
I have never heard the assumption that the objects don't deform. Assuming
small elastic deformations during the collision is popular, or even small
inelastic deformations, but never *no* deformation...
Even at school I remember doing the coefficient of restitution in physics
classes, that allows you to calculate what happens during inelastic
collisions:
http://en.wikipedia.org/wiki/Coefficient_of_restitution
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