Question

A 0.10 kg model rocket's engine is designed to deliver an impulse of 6.0 N*s. If the rocket engine burns for 0.75 s, what is the average force does the engine produce?

Answer 1

$$J=F_{avg}\Delta t,$$ $$F_{avg}=\dfrac{J}{\Delta t}=\dfrac{6.0\ N\cdot s}{0.75\ s}=8.0\ N.$$