Educational enough for you lol
http://en.wikipedia.org/wiki/Thrust
Please note:
A
rocket is propelled forward by a thrust force equal in magnitude, but opposite in direction, to the time-rate of momentum change of the exhaust gas accelerated from the combustion chamber through the rocket engine nozzle. This is the
exhaust velocity with respect to the rocket, times the time-rate at which the mass is expelled, or in mathematical terms:
where
T is the thrust generated (force),
is the rate of change of mass with respect to time (mass flow rate of exhaust), and
v is the speed of the exhaust gases measured relative to the rocket.