Question

what is meant by retardetion and si unit​

Answer 1

When the velocity decreases with respect to time it is termed as retardation or deceleration. In reality negative acceleration is commonly called retardation Its SI unit. is m/s2.

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Answer 2

Answer:

Retardation, actually, is acceleration that acts opposite to the direction of motion of an object. So, under retardation, an object accelerates away from its direction of motion, so it's velocity in that direction decreases. The SI unit of retardation, it being just an oppositely directed acceleration, is m/s^2.