1. The problem statement, all variables and given/known data A ball is thrown at the edge of the roof of a building in a direction at an "alpha" angle above the horizontal. It landed 5 seconds later at 50 meters from the building. The maximum height reached by the ball during its trajectory is 20 meters above the roof. Find The initial velocity and the angle with which it was launched . 2. Relevant equations 3. The attempt at a solution I found the equations: y(x)=-0.5(g*t^2+Vo*sin(alpha)*t + L (with L the height of the building(that I don't have btw)) but I can't go anywhere without L or alpha.