5. A billiard ball, initially at rest, is given a sharp impulse by a cue. The cue is held horizontally a distance h above the centerline as in Fig. 10-28.
The ball leaves the cue with a speed vo and, because of its "forward English" (spin), eventually acquires a final speed of 9vo/7.
Show that h = 4R/5, where R is the radius of the ball.