Given information
From the question we get the following values:
The pace at which the rocket's gases are ejected 
The rate at which gases are ejected 
Step-by-step explanation
A rocket in flight is a massive mass system. The rocket is pushed forward by the expulsion of hot gases from the rocket. The propelling gases and the rocket can be regarded to be an independent system. Because there are no external forces involved in the process of ejecting gases from the rocket. As a result, the system's momentum is conserved.
Lets,
m =the mass of the pushing gases
v = their velocity.
The gas's change in momentum is given by,
The force of expulsion of the gases = The force acting on the gases.
According to Newton’s second law, It says that the temporal rate of change of a body's momentum is identical in size and direction to the force applied to it.
So, the force measured in newton = the rate of change of momentum.
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Physics: Principles with Applications
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