1. The problem statement, all variables and given/known data I need to find the acceleration of the object at its highest point?? I thought it would be zero, but that is wrong. -The initial velocity is 26 m/s at 54 degrees above the horizontal axis. -it's initial horizontal velocity is 15.3 m/s and vertical is 21.0 m/s (is this acceleration?) -It reaches a height of 22.6 meters -in 2.15 seconds -the balls velocity at its highest point is 15.3 m/s What's the balls acceleration at its highest point? For how long a time is the ball in the air? When the ball lands on the court, how far is it from the place where it was hit? Please explain. I'm not sure which values to use for initial velocity, etc. when I use the formulas. 2. Relevant equations 3. The attempt at a solution I thought I should use the velocity-time equation. final velocity=initial velocity + acceleration*time I did 15.3= 26+ 2.15a but the answer was incorrect. What am I doing wrong?