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rate of change of the position of an object as a function of time, and the direction of that change

Velocity is a measure of how fast something moves in a particular direction.[1] In other words, a velocity is a speed with a direction. For instance, if an object moves east at 9 metres per second (9m/s), we would say that its velocity is 9 m/s to the east.

To calculate the velocity of an object, we divide its displacement (its change of position) by the time it took to change position.[1]

For example, if an object moves 20 meters (m) to the left in 1 seconds (s), its velocity (v) would be equal to:

A change in velocity is acceleration


  1. 1.0 1.1 "Physics Homework Help: Speed, Velocity, Acceleration". Retrieved 25 March 2010.