Question

Why do you think that if you drop two balls, exactly two balls rise on the other side at a similar speed? Why doesn’t one ball fly off quickly instead? Why don’t three balls fly off slowly?

Answer 1

It conserves both energy and momentum in the collision at the same time. By design, when the balls collide the strings that hold them up are vertical (assuming balls are only swung from one side).

: Hope this helps :)