Originally Posted by nightfire700
Well I am not a tennis expert, but common sense will tell me that the exact distance to contact point is not known before hand when you are swinging the racquet. Hence its just not possible to start decelerating or swing such as to reach max velocity at the exact contact point because its not known till you actually hit the ball. Your only option is then to whip hard and continue to accelerate (or add velocity) till you hit the ball. Once the ball is hit and the signal is received by the brain, thats when you will start decelerating and get into the follow through mode and that would be well past the actual contact point and hence its safe to assume that the peak velocity will be a little after the contact point and not at the contact point or before the contact point.
That seems to be true for the upward component of the speed, but not the forward component, or the net speed. That is because you did not factor in the effect of the impact. It has substantial effect in reducing the acceleration.