1. The problem statement, all variables and given/known data The "force platform" is a tool that is used to analyze the performance of athletes by measuring the vertical force as a function of time that the athlete exerts on the ground in performing various activities. A simplified force vs. time graph for an athlete performing a standing high jump is shown in Figure P6.66. The vertical divisions of the graph represent 0.65 kN and the horizontal divisions represent 0.50 s. The athlete started the jump at t = 0.0 s. How high did this athlete jump? Picture of graph: http://www.webassign.net/sercp/p6-66alt.gif 2. Relevant equations J = FΔt J = ΔP J = m(vf - vi) FΔt = mvf (since the jump starts from rest) 3. The attempt at a solution From the graph I was able to get that the impulse is 650N. The problem is I have no idea how to use this to get the height he jumped, I feel like I need a mass to solve this. Given that J = m(vf - vi) This means that FΔt / m = vf (vi is 0 because starting from rest) This vf would be the vi for the jump, so mgh = 1/2 m v^2 h = v^2/2g h = (650/m)^2/2g h = 422500 / 2*g*m^2 I'm stuck from here, none of my classmates could figure it out either. If somebody could give me a push in the right direction I would appreciate it. I feel like the solution is obvious and I'm just thinking too hard.