Some bumper cars are moving around a circular track at the same constant speed. However, they are not all going in the same direction. Collisions are perfectly elastic, so that two colliding cars instantaneously change directions (and continue at the same speed).

Show that at some point in the future, all the cars will be back to their starting positions and directions. Assume that each car has no length.

basically they have to show up in the same spot it has to happen it's law

not really but it will happen

 

Posted by david on 2005-03-22 13:10:59