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Newton's law of impact


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A law formulated by Sir Isaac Newton (1642–1727) after his studies of the impact between elastic bodies. He observed that if two bodies move towards each other along the same straight line, the difference between their velocities immediately after impact has a constant relationship with the difference between their velocities at the moment of impact: (v1v2)(u1u2) = −e, where e is the coefficient of restitution, v1 and v2 are the velocities of the two bodies immediately after impact, and u1 and u2 are the velocities of the two bodies immediately before impact.

Subjects: Sports and Exercise Medicine.


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