Macmillan Learning 47.1% A ball of unknown mass m is tossed straight up with initial speed v. At the moment it released, the ball is a height h above a spring-mounted platform, as shown in the figure. The ball rises, peaks, and falls back toward the platform, ultimately compressing the spring a maximum distance d from its relaxed position. Assume that the spring is perfectly ideal, with spring constant k, and that the mass of the spring and platform is negligible. Greg SB Dr Gr What is the mass of the ball, m, suming that there is no friction or air resistance?