Question

A rocket of mass 1000kg fuel is consumed at a rate of 40 kg/s the velocity of a gases ejected from the rocket is 5×10^4 m/s the thrust on rocket is

Answer 1

F = dp/dt

Or: Force = change in momentum over change in time

P =mv

dP/dt = mdv/dt + vdm/dt

mdv/dt isn’t going to help much here, so let’s say it’s zero. This gives us velocity times mass flow.

Just multiply mass flow and exhaust velocity. 40 kg/s times 50000 m/s