The International System (SI) unit of retardation is ______.
\(ms^{-2}\)
Retardation (deceleration) is simply negative acceleration, that is, the rate of decrease of velocity with respect to time. Dimensionally and numerically its magnitude has exactly the same unit as acceleration.
Acceleration is defined as change in velocity per unit time: unit of velocity is \(m\,s^{-1}\) and dividing by time (seconds) gives \(m\,s^{-2}\). Therefore the SI unit of retardation is \(m\,s^{-2}\). Hence, \(ms^{-2}\).
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