A body has an acceleration of $- 4 {m s}^{- 2}$ . Then its retardation is equal to:

- 4 {m s}^{2}

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4 {m s}^{- 2}

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Zero

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Can't be determined

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Solution

The correct option is B $4 {m s}^{- 2}$
The change in the velocity of an object per unit time is known acceleration.
Retardation is negative acceleration.
Given,
Acceleration, $a = - 4 m / s^{2}$
Retardation $= - a = - (- 4) = 4 m / s^{2}$

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