1. The problem statement, all variables and given/known data Small rockets are used to make small adjustments in the speed of satellites. One such rocket has a thrust of 35 N. If it is fired to change the velocity of a 72 000 kg spacecraft by 63 cm/s, how long should it be fired? 2. Relevant equations Momentum = Mass x Velocity 3. The attempt at a solution After reading the instructions, I'm still having difficulty on this particular problem. There is a formala called pbefore = pafter Where momentum in one object transfers to another when hit. But I just don't know where to begin. Thanks.