Pick out the wrong statement about retardation.

Retardation is negative acceleration

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Retardation is rate of decrease of velocity with time

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SI unit of retardation is

m s^{- 2}

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Retardation is a scalar quantity

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Solution

The correct option is D Retardation is a scalar quantity
Retardation, or negative acceleration, is nothing but an acceleration which decreases the speed. Its SI unit is same as that of acceleration. Just like acceleration, it has both magnitude and direction, i.e. it is a vector quantity. So option D is the wrong statement about retardation.

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