| vector quantity v = dr/dt, where r is position vector and t is time NOTE 1 The velocity is related to a point described by its position vector. The point may localize a particle, or be attached to any other object such as a body or a wave. NOTE 2 The velocity depends on the choice of the reference frame. Proper transformation between frames must be used: Galilean for non-relativistic description, Lorentzian for relativistic description. NOTE 3 The coherent SI unit of velocity is metre per second, m/s.
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