Question

A rocket burns fuel at a rate of 251 kg/s and
exhausts the gas at a relative speed of 7 km/s.
Find the thrust of the rocket.
Answer in units of MN.
Don't round answer.

Answer 1

The thrust force of the rocket

$$F=\frac{\Delta m}{\Delta t}v$$

$$=251\:\rm kg/s\times 7000\: m/s=1.757\times 10^6 \: N$$