1. The problem statement, all variables and given/known data 2. Relevant equations 1/2mv^2, mgh, and basic kinematics equations 3. The attempt at a solution I set the height = 0 at moment before the launch. To get the velocity, I used: energy before the ball starts accelerating (PE) = energy right before the ball leaves the ark (KE) I'm stuck on Part B, because I'm having trouble getting the angle of the launch. I set the x axis as the ground. Thank you for your help.