This free fall problem seems simple, but I can't get it. you have a rocket fired from rest with an acceleration of 40 m/s^2. It runs for 2.5 and then falls. I'm wanting to find the maximum height, which I think would require me getting the initial velocity first. v = v0 + at 0 = v0 + 40(2.5) v0 = -100 (wrong, it's going up?) then I thought just plugging into the equation x = x0 + v0t + .5at^2 would work, but the v0 is obviously wrong. I don't see what I'm doing wrong, though. The answer should be 635m. Can anyone point out where I'm going wrong?