Velocity  

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Velocity is the speed and the direction of motion of an object. Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies.

Velocity is a physical vector quantity: both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called Template:Em, 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.

See also

• Four-velocity (relativistic version of velocity for Minkowski spacetime)
• Group velocity
• Hypervelocity
• Phase velocity
• Proper velocity (in relativity, using traveler time instead of observer time)
• Rapidity (a version of velocity additive at relativistic speeds)
• Terminal velocity
• Velocity field
• Velocity vs. time graph