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DEACCELERATION:
Negative acceleration (Retardation) : If the velocity of a body decreases in the same direction, the body has a negative acceleration or it is said to be retarding e.g. A train slows down.
When velocity of a particle increases with time, it is said to be accelerated motion i.e.both acceleration and velocity will be positive and speed (magnitude of velocity) would increase.
When both acceleration and veloctiy are negative, that would mean that the direcction of motion is in the opposite direction but in this case also speed of particle would increase with time.
If acceleration and velocity are of opposite signs, in that case speed of the particle would decrease. Deceleration is equivalent to negative of acceleration.



