1. The problem statement, all variables and given/known data A car of mass 850 kg is driven at a steady speed of 70 km/hr up a hilly road with a slope of 30°. Using the macroscopic energy equation, determine the power delivered by the engine of the car. 2. Relevant equations E= KE + PE E = (1/2)mC^(2) + mgz Power = E/t 3. The attempt at a solution My attempt at a solution was: E = 1/2mC^(2) + mg(Ctsin(30)) E = 1/2(850)(19.44)^(2) + (850)(9.81)(19.44)tsin(30) Therefore Power = (1/2(850)(19.44)^(2))/t + (850)(9.81)(19.44)sin(30) Why do I still have an unknown t? I am supposed to be able to solve it with the information given but I can't get it! Please please help!