Solution:
A1 = 10-(10 * 80/100) = 2 meters.
A2 = 2 – (8 * 80/100) = 0.4 meters.
A3 = 0.4 – (0.4 * 80/100) = 0.08 meters.
A4 = 0.08 – (0.08 * 80/100) = 0.0736 meters.
A5 = 0.0736 – ( 0.0736 * 80/100) =
Hit #1, results in the ball rebound distance plus falling distance, this is 2*80/100*10 m
Hit #2, …. 2*(80/100)² 10m
Hit #3, …. 2*(80/100)³ 10m
the equation becomes 2*(80/100^n)*10m, n being the sum to infinity.