define acceleration and retardation ? what is its unit
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Negative of acceleration is known as retardation. Negative Acceleration is called Retardation, or Deceleration. Examples of retardation motion are: 1) Velocity of the vehicle decreases when the brake is applied. The SI unit of retardation, it is just an oppositely directed acceleration, is m/s^2.
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Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.
SI unit: m/s2 (metre per second square)
Retardation means negative acceleration. A body is said to be retardated if it's velocity is decreasing.
SI unit: m/s2
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