how the rocket work?

Answer 1

For every action there is an equal and opposite reaction. Pushing fuel out will provide a little push, but igniting it will release the energy in the fuel and provide a much bigger push!

Answer 2

It's the same as if you threw a bowling ball while standing on a skateboard. You'd move backwards. The rocket throws hot gas.

Answer 3

pushing fule out of the rocket at high speed forces the rocket in the opposite direction!!!!