A rocket expels a gas at rate of 0.5kg/s if the force produced by the rocket is 2000N what is the velocity with which gas expelled

Answer 1

F = d/dt momentum = d/dt (m v) = v dm/dt + m dv/dt
v is constant
so
F = v dm/dt =
2000 = v (0.5)
v = 4000 m/s