Speed is a scalar quantity that is defined as the change in position of an object with respect to time. It is the magnitude of a velocity vector.  Mathematically, it is described by the following equation:

He's going the distance...he's going for speed
where the variable d represents distance and the variable t represents time.  Although speed and velocity are the same numerically (i.e. in magnitude), the equation is often seen with either the variable s (speed) or v (velocity).


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Last update: Thursday, January 31, 2013