To hit a flat serve in tennis
Calculates how high above the center of the net to aim to land a flat serve in tennis.

| Height of the ball’s center relative to the top of the net |
A flat serve generates the most speed, but unless you are tall, theoretically, most of them will not land in the court.
Assumptions
・The distance from the serving position to the opponent’s service line is 18.285m (6.4m + 11.885m)
・The ball must clear the center of the net, which is 0.914m high
・The diameter of the ball is 6.7 cm
Assumptions
・The distance from the serving position to the opponent’s service line is 18.285m (6.4m + 11.885m)
・The ball must clear the center of the net, which is 0.914m high
・The diameter of the ball is 6.7 cm
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