1. The problem statement, all variables and given/known data A quarterback can throw 60yd @ 45 degree angle. How fast can he throw? 2. Relevant equations 60 yds = 54.86 meters 3. The attempt at a solution x-direction d = vt 4.86 = vcos(45)(t) y-direction d = vt + 1/2at^2 d = vsin(45)t + 1/2(9.8)t^2 I want to solve for t in both equations, set them equal, and use that to solve for v but I don't know what to use for d in the y-direction equation. would it be zero because it ends up on the ground?