Suppose a rubber ball, when dropped from a given height, returns to a fraction p of that height. In the absence of air resistance, a ball dropped from a height h requires √2h/g seconds to fall to the ground, where g ≈ 9.8 m/s² is the acceleration due to gravity. The time taken to bounce up to a given height equals the time to fall from that height to the ground. How long does it take a ball dropped from 10 m to come to rest?