Describe Population Age Distributation.

Explanation

Rocket propulsion is the process that uses force to move a rocket off the ground into the atomsphere .
(i) Propulsion of rockets is based on law of conservation of linear momentum as well as Newton's III law of motion .
(ii) Rocket sare filled with a fuel ( either liquid or solid ) in the propellant tank .
(iii) When the rocket is fired, this fuel is burnt and a hot gas is ejected with a high speed from the nozzle of the rocket producing a huge momentum .
(iv) to balance this momentum , and equal and opposite reaction force is produced in the combustion chamber , which makes the rocket project forward .
(v) While in motion , the mass of the rocket gradually decreases , until the fule is completely , burnt out. Since , there is no net external force acting on it , the linear momentum of the system is conserved .
(vi) The mass of the rocket decreases with altitude , results in the gradual increase in velocity of the rocket .
(vii) At one stage , it reaches a velocity , which is sufficient to just escape from the gravitational pull of the Earth. This velocity is called escape velocity.