1. The problem statement, all variables and given/known data A tennis player hits a ball at ground level, giving it an initial velocity of 21.0 m/s at 58.0 deg above the horizontal. What is the ball's velocity at the highest point? 2. Relevant equations Vx=Vocos(theta) Vy=Vosin(theta) y=1/2-g(t^2)+Vy(t) V-Vo/a = t 3. The attempt at a solution I've completed all of the steps up to this point and arrived at the conclusion that the velocity of the ball at the highest point must be zero, theoretically speaking, of course. When I input 0 m/s, the answer was marked as incorrect. What am I missing. Final velocity must be zero since the balls velocity slows down to zero when it's at the maximum distance. It also asked for the acceleration at the highest point and theoretically speaking, the answer was 9.8 m/s^2, which is consistent with theory. What gives?!