Small rockets are used to make tiny adjustments in the speeds of satellites. One such rocket has a thrust of 35 N. If it is fired to change the velocity of a 72300 kg spacecraft by 64 cm/s, how long should it be fired?

Answer 1

Calculate the desired momentum change.
72300 kg * 0.64 m/s = ?

That equals the impulse needed.

Divide the impulse by the force to get the time needed.