1. The problem statement, all variables and given/known data I am trying to find the velocity of a car as it is going down hill. I have the final velocity which is 11.2 m/s and the initial velocity which is 2.23m/s. I have to include Air drag to get my velocity. I also know that there was 21,456 J of energy lost from up the hill to down the hill. I also know that the hill is 18 m long...Here are more variables that i was given Coffiecient of drag: 0.38 Density of air: 1.293 kg/m^3 Cross-sectional are of car: 1.4 m by 1.6 m Angle of hill: 10 degrees Coefficient of rolling friction: 0.020 2. Relevant equations The only thing I have to work with is the drag force equation. F(D)=0.5pv^2C(D)A p=Density of air C(D)=coefficient of drag A=cross-sectional area of the car v=velocity of car 3. The attempt at a solution I am contemplating on using that but velocity is involved in the equation and velocity is what Im looking for.