PHYS121 - Learning Assignment: Conservation of Energy A car is traveling 70km/hr when it comes to a hill with a 30 degree incline. The engine stops at the moment it begins moving up the hill so that it is just rolling freely. How far up the hill will the car make it before it comes to a stop? If the car's mass is 1000kg and it only makes it 75% of the way up the hill that you calculated above, how much energy was lost to friction and other non-conservative forces while rolling up the hill? If it was a sliding block of mass 10kg instead of a rolling car, and it only made it 75% of the way up the hill that it would have made it if there had been no friction, what is the average frictional force that was acting on that sliding mass while sliding up the hill?