1. The problem statement, all variables and given/known data An 80 kg man jumps from a height of 3.00 m onto a platform mounted on springs. As the springs compress, the platform is pushed down a maximum distance of 0.200 m below its initial position, and then it rebounds. The platform and springs have negligible mass. a. what is the man's speed at the instant the platform is depressed 0.100 m b. if the man had just stepped gently onto the platform, how far would it have been pushed down? 2. Relevant equations a = V/t v = d / t F = ma 3. The attempt at a solution i've tried solving this one, and im stuck. heres what i did: a = V/t V = at V = d/t d/t = at t = (d/a)^-2 = 0.553 s V = 9.81(0.553) = 5.425 s F = ma = 80 kg (9.81) = 62.784 kJ and i dont know what to do next... please help me.