일반물리학 1 — Motion in Two and Three Dimensions: Problem 52

52 A ball is to be shot from level ground toward a wall at distance \(x\) (Fig. 4-34a). Figure 4-34b shows the \(y\) component \(v_y\) of the ball’s velocity just as it would reach the wall, as a function of that distance \(x\). The scaling is set by \(v_{ys} = 5.0 \text{ m/s}\) and \(x_s = 20 \text{ m}\). What is the launch angle?