empioyed

 empioyed for space journey. A

aelite launch vechicle is a multistage rocket capable of launching an artificial
atellite into a predetermined orbit. In classical mechanics, the mass of a body
ik considered to be a constant. We shall now examine a case of considerable
practical importance where the mass of a body changes continuously. In the
case of satellite launch vehicles, the corresponding mass decreases
continuously as the fuel burns out. At each stage of a multistage rocket burns
out its fuel, it is separated automatically from the last stage and its casing is
discarded. It this way, the mass of the body decreases continuously.
A rocket works on the principle of jet propulsion. From the word jet
we mean a high velocity stream of fluid issuing out of a