Explain the launching of a rocket?

Answer 1

I think it was most eloquently explained by the German rocket pioneer Werner Von Braun demonstrating the operation of a V2 rocket to the US Air Force during his work for the Americans after WWII, "No pokenzee fingers und ze nozzleverks. Jest zeet back und vatcha der stoofen kum oot. Der Stoofen kums oot zee nozzleverks, und zee whole zing goes oop."

Answer 2

It is a classic example of Newton's Law of action and opposite reaction. As long as the reaction exerts a force that exceeds gravity in magnitude, the rocket will accelerate up away from the surface.

Answer 3

You need enough trust to break out of the hold of gravity.
Check the NASA website for more info