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I took a video of my serve (60 FPS) and it took 0.4 seconds from my racket to the service line. How fast would you say my serve was?

10.06.2025 10:27

I took a video of my serve (60 FPS) and it took 0.4 seconds from my racket to the service line. How fast would you say my serve was?

The speed of a tennis ball is generally measured right off the racket, and it’s only going to slow down, not speed up. That said, a tennis ball that comes off the racket face at, say, 115 mph is going to get to the receiver sooner than a ball hit at, say, 100 mph, notwithstanding that both will slow before getting to the receiver.

In fact, the ball flexes throughout its flight. In other words, some portion of the energy imparted by the racke...

There are two major factors that slow the ball. One is the flexibility of the ball itself. If you’ve ever seen a photo of a ball at the instant of impact, you can see that the diameter of the ball increases because the impact flattens out the ball.

Hello, I have a question about astral projection. I started to get interested in this a little while after my mum passed in april. I thought I may be able to see her and speak with her if I managed to achieve astral projection. Since this interest, every time i sleep on my back I go into sleep paralysis. However, I cant progress into astral projection because it is very scary for me as I feel like I'm suffocating when this happens. I panic and force myself to wake up. This only ever happened about once a year before this. It sometimes lasts a long time. This has happened about 3 times per week since my mum died, as mentioned on a previous post. I no longer try to go into it anymore(due to the suffocating feeling), but it still happens. I read that sleep paralysis is the pathway to astral projection. Why has this started to happen so frequently since simply taking an interest in it? Is this connected to the afterlife? I am concerned about it as I now cannot seem to stop this happening. Could it be my mum trying to communicate? Im asking due to more knowledge around this in this group.

I don’t know, but I do know some other things about the serve in general.

At most tournaments, the speed of a serve is commonly measured and draws comment if it’s unusually fast or slow. But think about a tennis ball and when it’s going xxx mph. Where exactly is it going xxx mph?

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