Now we deal with the case where the mass of an object is changing. Two forces an action and a reaction are needed for an interaction How many forces are required for an interaction. Pin On Weapons Missiles Torpedoes This is the factor ΔmΔt in the equation. . A gravity b Newtons law of motion c its exhaust gases d the atmosphere against which the rocket pushes. This problem has been solved. This is provided by pushing against the ground with 250 N. The force that propels a rocket is provided by. First the greater the exhaust velocity of the gases relative to the rocket v e the greater the acceleration is. Expert answeredjerry06Points 9275 Log in for more information. We analyze the motion of a rocket which changes its velocity and hence its momentum by ejecting burned fuel gases thus causing it to accelerate in the opposite direction of the velocity of the ejected fuel see Specifically. Select your answers ...