1. The problem statement, all variables and given/known data A car of weight 7000N travels at a steady speed of 8m/s up a steady incline at 15degrees above the horizontal. The car's motion is opposed by a constant frictional force of 500N. 2. Relevant equations Calculate: a) the gain in p.e per second b) the work done per second against friction c) the car's engine power. 3. The attempt at a solution I keep getting the wrong answer. It would be easier if I knew the distance traveled by the car but I don't know any suitable formula. Help is appreciated!