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The rate of change of position of an object respect to its surrounding
The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north).
Velocity is the rate at which the position changes. The average velocity is the displacement or position change (a vector quantity) per time ratio.