When a ball is pushed into water, it moves upward why

Is it possible to use the energy from two atoms colliding to create a clean burning lasting fuel source with a large amount of force? is it also possible to harness that energy from the two atoms colliding to create a clean energy source that will last for years from just two atoms colliding. is there a possibility to control and store that energy for years but slowly let the energy out enough to power cities cheaper and faster.

The energy released by a nuclear fusion reaction is produced when

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?