A 1000 kg car traveling on a road that runs straight up a hill reaches the rounded crest at 25 m/s. If the hill at that point has a radius of curvature of - in a vertical plane - 75 m, what is the net downward force acting on the car at the instant it is horizontal at the very peak? How fast must the car go in order to leave the ground? Honestly, I'm not even sure how to get started. I'm looking for FN and the car's velocity, but I have no idea what the first step should be. Help please?