Kinetic Energy is not necessarily Conserved in a Collision

Theorem

Let two bodies be in collision.

The total kinetic energy of the two bodies before the collision may not necessarily be the same as the total kinetic energy of the two bodies after the collision.

Proof

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Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): collision
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): collision