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\(\textit{Acceleration}\) 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 \(angle/time^{2}\).
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In SI units, linear acceleration is measured in \(meters/second^{2}\) (\(m \cdot s^{-2}\)),
and angular acceleration is measured in \(radians/second^{2}\).
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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.
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