A thing is going 5 m/s. That’s a speed of 5 meters per second
A second later, its speed is now 10 m/s.
After another second, its speed is 15 m/s.
After another second, its speed is 20 m/s.
So it looks like for every second of time, the speed goes up by 5 m/s, right? That means the thing is accelerating, with an acceleration of 5 m/s per second. Aka the speed is changing by 5 meters per second, per second.
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