a 59.5-kg athlete leaps straight up into the air from a trampoline with an initial speed of 9.8 m/s. the goal of this problem is to find the maximum height she attains and her speed at half maximum height. (a) what are the interacting objects and how do they interact? this answer has not been graded yet. (b) select the height at which the athlete's speed is 9.8 m/s as y