In view of the fact that the study of collision is one of the basic problems of mechanics, the Royal Society of Britain decided in 1668.

We will mobilize the scientific community to find out the law of this phenomenon from experiments and theories, and offer a reward for it.

Text. Three people apply and systematically summarize their independent work. They were the first to put forward this theory.

The article was written by JohnWallis, who discussed the collision of inelastic objects. He thinks that the collision

Momentum is the decisive factor, and the sum of momentum before and after collision should remain unchanged.

On elastic collision, one is Ryan and the other is Huygens Ryan's elastic collision theory.

Extraordinary law, that is, when the speed of two objects is inversely proportional to the mass, they will collide at the original speed.

Rebound, he also found the general formula for the final speed, but Ryan only got it from the experiment.

The empirical formula has not been further proved in theory.