1. The problem statement, all variables and given/known data A projectile is launched 80m/s into the air at angle x to the horizontal off the top edge of an infinitely long hill(inclined plane). The hill makes a 35 degrees angle to the horizontal a) Derive an equation for the range(maximum horizontal displacement). b) At what angle will the projectile have maximum range? 2. Relevant equations I know the equation for range of an even surface and how to derive it but I don't think that will be of help here. 3. The attempt at a solution Is this question even possible? I'm tried to derive an equation but with no luck. That's the hard part. I think I just need to differentiate the equation to get the angle of maximum range.