1. The problem statement, all variables and given/known data A baseball is thrown from the roof of a building of height 21.2m with an initial velocity of magnitude 10.7 m/s and directed at an angle of 54.4 degrees above the horizontal. a. What is the speed of the ball just before it strikes the ground? Use energy methods and ignore air resistance. b.What is the answer for part (A) if the initial velocity is at an angle of 54.4 below the horizontal? 2. Relevant equations PE=mgh KE=1/2mv^2 KEi+PEi=KEf+PEf 3. The attempt at a solution I'm not exactly sure where to begin. I'm thinking I have to find the max height the ball achieves using projectile motion methods then use conservation of energy?