Wikipedia States that Newton's law of restitution is valid only for one dimension collision. I understand this from the derivation, which involves conservation of energy and conservation of linear momentum. It isn't valid for 2D collision, because the velocity term in conservation of momentum must be along one direction, and the kinetic energy includes net velocity along all directions.

My question is, is there a generalisation of Newton's law of collsion to 2D collision?


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