A ball is to be shot from level ground toward a wall at distance x (Figure a).

Question:

A ball is to be shot from level ground toward a wall at distance x (Figure a). (Figure b) shows the y component vy of the ball's velocity just as it would reach the wall, as a function of that distance x. The scaling is set by vys= 5.0 m/s and xs = 20 m.What is the launchangle?