Assume that we are at rest relative to an inertial reference frame. watching a rocket accelerate through deep space with no gravitational or atmospheric drag forces acting

on it. For this one-dimensional motion, let M be the mass of the rocket and v its velocity at an arbitrary time.depends only on design characteristics of the rocket engine, namely. the rate R at which it consumes fuel mass and the speed with which that mass is ejected relative to the rocket. We can this term the thrust of the rocket engine and . represent it with T. Newton’s second law emerges clearly if we write as T = Ma, in which a is the acceleration of the rocket at the time that its mass is M.