Problem with energy conservation law?

Posted October 14th, 2008

Pythagor asked: Hello,
I have got a problem which is described below.
A heavy metal ball starts to fall from 1 meter height, ant this ball hits a light tennis-ball on the table. After the hit, metall ball rises nearly to 1 meter height. To what height does a light tennis-ball rise?
In my opinion, energy conservation law [...]