Term information
In physics, velocity is the measurement of the rate and direction of change in the position of an object. It is a vector physical quantity; both magnitude and direction are required to define it. The scalar absolute value (magnitude) of velocity is speed, a quantity that is measured in meters per second (m/s or ms1) when using the SI (metric) system. 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 ( \Delta \mathbf{x}) during a time interval (t) is described by the formula: \mathbf{\bar{v}} = \frac{\Delta \mathbf{x}}{\Delta t}. unit: m/s source:http://en.wikipedia.org/wiki/Velocity