In physics, velocity is defined as the rate of change of position. It is a vector physical quantity; both speed and direction
are required to define it. In the SI (metric) system, it is measured in meters per second: (m/s) or ms-1. The scalar
absolute value (magnitude) of velocity is speed. For example, "5 meters per second" is a scalar and not a vector,
whereas "5 meters per second east" is a vector. The average velocity v of an object moving through a displacement (Δx)
during a time interval (Δt) is described by the formula:






The rate of change of velocity is referred to as acceleration.




Source: WikipediA
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