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Acceleration

Acceleration is the (instantaneous) rate of change of velocity. Acceleration may be either linear acceleration, or angular acceleration. It is a vector quantity with dimension \(length/time^{2}\) for linear acceleration, or in the case of angular acceleration, with dimension \(angle/time^{2}\). In SI units, linear acceleration is measured in \(meters/second^{2}\) (\(m \cdot s^{-2}\)) and angular acceleration is measured in \(radians/second^{2}\). In physics, any increase or decrease in speed is referred to as acceleration and similarly, motion in a circle at constant speed is also an acceleration, since the direction component of the velocity is changing.

http://dbpedia.org/resource/Acceleration

http://en.wikipedia.org/wiki/Acceleration