A golf ball is struck at ground level. The speed of the golf
ball as a function of the time is shown in the figure, where t = 0
at the instant the ball is struck. The scaling on the vertical axis
is set by va= 20 m/s and vb= 31.6 m/s. (a) How far does the golf
ball travel horizontally before returning to ground level? (b) What
is the maximum height above ground level attained by the ball?