1. The problem statement, all variables and given/known data When a ball was thrown and caught at the same height from which it was thrown, it was measured to have travelled 12 meters in 1.3 seconds. What was the launch velocity? The answer on the key says 11.2 meters per second. 2. Relevant equations Yfinal = Yinit + Vt + 1/2 a t^2 3. The attempt at a solution If it goes 12 meters in 1.3 seconds, then it hit its peak in .65 seconds at 6 meters. So Yfinal = 6 and Yinit = 0 and t = .65 and a = -9.81 Plugging that all in and solving for V I get 12.419 m/s. But my teacher on the key says the answer is 11.2 m/s. Where am I going wrong?