In my honors course we are covering kinematics concepts. There was this problem which stumbled me but then I figured out what I did wrong. I just want to make sure my concept was right. Here is the problem... A diver springs upward with an intial speed of 1.8 m/s from a board that is 3 meters above the surface of the pool (his displacement is y = -3m). What is the highest point he reaches above the water. So this was my equation vi = 1.8 m/s vf = 0 m/s a = -9.8 m/s2 x = ? Solved the equation and got x = 3.16 or 3.2 So the part that kind of confused me in the begining was that I only had vi and vf. There had to be one more piece to solve the equation. Thats when I realized that gravity works even when the object has a positive velocity in the upward y direction. But then I started doubting my self so Im kind of confused.