1. The problem statement, all variables and given/known data A vehicle has a mass of 600 kg. Its engine provides a forward force of 1500 N, but the motion is resisted by a constant frictional force of 300 N. Calculate a) the acceleration of the vehicle, b) its momentum 6.0 s after starting to move. 2. Relevant equations F=ma a=f/m Change in Moment = Force x Time. 3. The attempt at a solution using a=f/m i can get acceleration easily. 1500 - 300 = 1200 1200 / 600 = 2. a = 2 m/s^2 I think part B revolves around Change in Moment = Force x Time but I'm not sure as I can't see anyway to work it out using that formula but I'm unaware of another formula having time and monument in it. Time = 6. Force = 1200. 6 x 1200 = 7200?