Pg 522 (454) - Q22
If the ball’s height decreases by the same fraction r after each
bounce, then after the first bounce it should rise to 192r, after the second
to 192r2, and after the third 192r3. We know
that after the 3rd bounce the ball rises to 24, so 24 = 192r3.
Solving for r = ½, which is D.