Motion

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Acceleration: Acceleration is seen in non-uniform motion and it can be defined as the rate of change of velocity with time.

where, v = final velocity, u = initial velocity

If v > u, then ‘a’ will be positive (+ve).

Retardation/ Deaceleration: Deceleration is seen in non-uniform motion during a decrease in velocity with time. It has the same definition as acceleration.

Here v < u, ‘a’ = negative (-ve).