Velocity is the directional speed of a object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time (e.g. 60 km/h northbound).[1] Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies.

As a change of direction occurs while the racing cars turn on the curved track, their velocity is not constant.
Common symbols
v, v, v
Other units
mph, ft/s
In SI base unitsm/s
DimensionL T−1

Velocity is a physical vector quantity; both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called speed, being a coherent derived unit whose quantity is measured in the SI (metric system) as metres per second (m/s or m⋅s−1). For example, "5 metres per second" is a scalar, whereas "5 metres per second east" is a vector. If there is a change in speed, direction or both, then the object is said to be undergoing an acceleration.

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