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WHAT IS CALLED RETARDATION?

Acceleration takes place when the velocity of a body changes. The velocity of a body may increase or decrease, accordingly the acceleration is of two types- positive acceleration and negative acceleration. If the velocity of a body increases, the acceleration is positive and if the velocity of a body decreases, the acceleration is negative. Negative Acceleration is also known as Retardation or Deceleration.

Retardation is measured in the same way as acceleration, that is retardation is equal to  and has the same units of "meters per second per second"

Example : Train comes to rest at the station.