When the speed of the tennis ball is measured in tennis matches, is it directly measured, or is it based on the time and distance between the ball hitting the two players'
How much topspin in tennis is considered good for an amateur player? I hit with an average of 1,400 rpm with a max of around 2,500 rpm. - Quora
![Model trajectories for a spinning tennis ball: III. The effect of a light wind on ground strokes | Request PDF Model trajectories for a spinning tennis ball: III. The effect of a light wind on ground strokes | Request PDF](https://www.researchgate.net/publication/345930718/figure/fig4/AS:1132466718941216@1647012514411/Model-trajectories-for-a-centre-line-ground-stroke-with-under-spin-oy0-400-rad_Q320.jpg)