Question

what do mean by collision​

Answer 1

Collision, also called impact, in physics, the sudden, forceful coming together in direct contact of two bodies, such as, for example, two billiard balls, a golf club and a ball, a hammer and a nail head, two railroad cars when being coupled together, or a falling object and a floor.

Answer 2

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In physics, a collision is any event in which two or more bodies exert forces on each other in a relatively short time