In the vertical jump, an athlete starts from a crouch and jumps upward to reach as high as possible. Treat the athlete as a particle and let ymax be...

In the vertical jump, an athlete starts from a crouch and jumps upward to reach as high as possible. Treat the athlete as a particle and let ymax be his maximum height above the floor. To explain why he seems to hang in the air, calculate the ratio of the time he is above ymax/2 moving up to the time it takes him to go from the floor to that height. You may ignore air resistance.