Question

Define Acceleration and Retardation.​

Answer 1

when the velocity of a body increases with respect to time ..It is called acceleration and when the velocity of an object decreases it is called retardation.

Answer 2

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Acceleration

acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing

Retardation

retardation is the act or result of delaying; the extent to which anything is retarded or delayed; that which retards or delays.