Question

what is retardation?

Answer 1

Hey.
Restardation:-Retardation is the act or result of delaying; the extent to which anything is retarded or delayed; that which retards or delays. 
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Answer 2

hi mate..

your answer...

RETARDATION :- {Negative acceleration is called retardation.}

If the velocity of a body is decreasing with respect to time, the acceleration is said to be negative.

Retardation is the rate of decrease in velocity.

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