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Velocity is a measure of how fast something moves in a particular direction.[1] For instance, if an object moves east at 7 metres per second (7 m/s), we would say that its velocity is 7 m/s to the east.[2] In other words, we could say a velocity is a speed with a direction.

To calculate the velocity of an object, we divide its displacement (its change of position) by the time it took to change position.

{\displaystyle \text{velocity} = \frac\text{displacement}\text{time}}[1]

For example, if an object moves 20 meters (m) to the left in 4 seconds (s), its velocity (v) would be equal to:

{\displaystyle \text{v} = \frac\text{20 m}\text{4 s} = \text{5 m/s to the left}}

A change in velocity is called an acceleration.

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