1. The problem statement, all variables and given/known data A 2,200-kg car is moving down a road with a slope (grade) of 14% at a constant speed of 11 m/s. 2. Relevant equations The equation that I'm using is ƩF=ma and friction=μN 3. The attempt at a solution the mass is 2200kg the acceleration is zero because of the constant speed. I really cannot think of anyway to solve this solution.