# Velocity

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.

## References

1. "Physics Homework Help: Speed, Velocity, Acceleration". physics247.com. Retrieved 25 March 2010.
2. "Vectors, Introduction". id.mind.net. Retrieved 25 March 2010.