define acceleration and retardation
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Acceleration of a body is defined as the rate of change of its velocity with time.Velocity of the body increases with time.i.e Acceleration = Change in velocity / Time taken for change
Retardation means negative acceleration. If the velocity of a body decreases,the acceleration is negative.
Example: The acceleration of a body is -5 m/s 2. then we can say that the retardation of the body is 5 m/s 2.
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noun: retardation the action of delaying or slowing the progress or development of something.