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velocity
A vector quantity specifying both the speed and direction of movement of an object in a given frame of reference. The magnitude of velocity is the scalar quantity speed (S), related to distance (s) and time (t) by the equation S = s/t; similarly velocity (v) is related to distance and time by v = ds/dt.
Related entries
• acceleration
• angular velocity
• kinematics
Related category
• CLASSICAL MECHANICS
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