1.) A 1900-kg car experiences a combined force of air resistance and friction that has the same magnitude whether the car goes up or down a hill at 27 m/s. Going up a hill, the car's engine needs to produce 47 hp more power to sustain the constant velocity than it does going down the same hill. At what angle is the hill inclined above the horizontal? P=F*v*cos (thetha) I am completely lost. Any help will be necessary. I just need a beginning. Anyways, here's my attemp. mg sign (thetha). 1900(9.8) sin (thetha) and solve for thetha to get the answer. But for some reason i know that i am wrong.