Rocket fuels are used. It contains chemical energy
Chemical energy, stored in the fuel the rocket takes with it.
momentum
Depends on the rocket. Some rockets use solid fuel, some use liquid.
You could use other non compressible liquids. You really are using the air trapped in the rocket as the energy source. The water compresses the air to very high levels and then is pushed back out the enf of your rocket.
The Chemical Potential Energy stored in a rocket will be converted to Kinetic Energy because the chemical fuel will launch the rocket into motion (Kinetic Energy).
From the rocket's movement energy (formally called kinetic energy). As the rocket slows down through friction, its kinetic energy is converted mainly to heat energy.
Mechanical energy is formed using a source of energy transferred to motion or electricity by means of gears. Every moving object has mechanical energy, whether it is a hammer driving a nail, a leaf falling from a tree, or a rocket flying in space.
chemical energy
green energy source
When an object - rocket or otherwise - rises, its kinetic energy gets converted to gravitational potential energy. At its highest point, if it rises directly upwards, all the kinetic energy will be converted to gravitational potential energy. However, its movement may also have a sideways component; in that case, not all the kinetic energy is converted to potential energy.
Chemical energy, stored in the fuel.
potential chemical energy
The term clean source of energy refers to only primary energy sources as wind or solar energy. Electricity, by definition, is not a primary energy source. It is a secondary energy source that is could be produced by a clean energy source as wind or any renewable primary energy source or produced by fossil energy source as oil, natural gas, or coal.