How To Calculate Average Speed
Question
What distance does the sprinter go in this example?
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How To Calculate Average Speed

Hi, my name's Charles, and I'm one of the math teachers from the Maxim Workshop. I'm just going to now, teach you how to do some math. In this video, I'm going to show you how to calculate average speed. Now, the average speed is something that you might want to be using a lot during, say, sports science to calculate how fast an athlete might be running or even within physics when you're looking at the motion of bodies such as planets or cars or even electrons. So, the first thing we want to do is look at average speed in more details. The average speed relates to, so we've got v bar which denotes average speed, and it is pretty much the change in distance. What I would do, I would denote distance by delta d and the time interval, the change in time that it takes for that body or the car or the athlete to run that distance. So you've basically got distance divided by time. Now, imagine if we've got a sprinter who does say 100 meters. So, delta d is a hundred meters. Now, if we look at the time that this distance is ran within, we can say a plausible time would be say ten seconds. Now, if we input these values into our equation here, we see that we have a hundred divided by ten. All we have to do now is just divide the hundred by the ten and we just have to cancel the zeros. We cancel this zero and we cancel that zero and that leaves ten. If you look at the units, meters is on the top, but seconds is on the bottom. So we have meters per second. Whenever you have units on the bottom, that are divisors, then they just acquire a negative one on the index just to show that it's a divider. That's ten seconds which is basically your speed, ten meters per second which is your average speed run during that hundred meters. That's basically how to calculate the average speed.