1. The problem statement, all variables and given/known data A car has a power output of 45kW and travels at a constant speed of 30m/s. What force is the engine applying on the car? 2. Relevant equations F=m*a W=ΔKE+ΔGPE KE=½mv^2 GPE=mgh W=F*d P=ΔE/ΔT gh_1+½v_1^2=gh_2+½v_2^2 3. The attempt at a solution I really have no clue. Since there is no change in energy (ΔE) in terms of kinetic or gravitational potential energy, I don't know what to do. Any help is much appreciated.