Question

define acceleration and retardation

Answer 1

Time rate of decrease of velocity is retardation. Acceleration is the rate of increase of velocity with time.


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.

hope it helps u..

Answer 2

acceleration is the rate of change of velocity of an object with respect to time
noun: retardation the action of delaying or slowing the progress or development of something.