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# Speed-Instantaneous Speed
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**Speed** refers to the rate at which an object travels. Unlike velocity, **speed** is a scalar quantity so direction does not matter. **Instantaneous speed** is the speed of an object in motion at a specific point in time. This is determined similarly to average speed, but we narrow the period of time so that it approaches zero. If an object has a standard speed over a period of time, its average and **instantaneous speeds** may be the same.

Let's talk about speed. Speed is how fast an object is moving. Scientific units for speed could be, kilometers per hour or meters per second, so what we're talking about is we're talking about a distance over time okay? So let's look at example how can we calculate the speed of an object okay? Well let's say I, I can't do this by the way, but let's say I could run 100 meters in 10 seconds, what is my speed? Okay? Well I say distance 100 meters over time 10 seconds, easy calculation there that is going to be 10 meters per second. That's how you calculate speed.

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