1. The problem statement, all variables and given/known data A long jumper leaves the ground at 45 degrees above the horizontal and lands 8.2 meters away. What is her "takeoff" speed v0? 2. Relevant equations x = x0 + v0t + 1/2at^2 v^2 = v0^2 + 2ad v = v0 + at 3. The attempt at a solution I can't seem to figure this problem out. Here's the information I got from the problem so far: x component: x0 = 0 x = 8.2 m a = 0 y component: y0 = 0 a = -9.8 m/s^2 There seems to be too many missing variables to solve the equation. I even tried breaking the projectile in half, which yielded me this: x component: x0 = 0 x = 4.1 m a = 0 v = v0 y0 = 0 a = -9.8 m/s^2 v = 0 EDIT: I forgot to mention I also realize that v0x and v0y components are equal, since the angle is 45 degrees. I know this is important, but I can't connect it to anything. I still can't seem to figure it out, since I need y, or how high the object goes at its highest point. I also can't figure out the time it takes... If I knew either of those, I could figure it out, but I can't seem to get anything from this. Thanks for your help.