Question

How the rocket starts with key or any other?what is the point of starting rocket?

Answer 1

It depends on the type of rocket

Answer 2

A rocket engine uses stored rocket propellantmass for forming its high-speed propulsive jet. Rocket engines are reaction engines, obtaining thrust in accordance with Newton's third law. Most rocket engines use combustion, although non-combusting forms (such as cold gas thrusters) also exist. Vehicles propelled by rocket engines are commonly called rockets. Since they need no external material to form their jet, rocket engines can perform in a vacuum and thus can be used to propel spacecraft and ballistic missiles.


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