Definition:Velocity

Definition
The velocity $\mathbf v$ of a body $M$ is defined as the first derivative of the displacement $\mathbf s$ of $M$ from a given point of reference time $t$:


 * $\mathbf v = \dfrac {\d \mathbf s} {\d t}$

Colloquially, it is described as the rate of change of position.

It is important to note that as displacement is a vector quantity, then it follows by definition of derivative of a vector that so is velocity.

Also see

 * Definition:Displacement
 * Definition:Position


 * Definition:Speed


 * Definition:Acceleration


 * Definition:Linear Momentum


 * Definition:Relative Velocity