What is positive and negative acceleration ?
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When the velocity of a body increases with time its acceleration is positive. Acceleration of an object is positive if its direction is the same as that of the direction of the motion of the object. ... Negative sign indicates that the direction of acceleration is opposite to the direction of motion of an object.
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ACCELERATION: THE CHANGE IN VELOCITY PER UNIT TIME IS CALLED ACCELERATION. IT IS A POSITIVE ACCELERATION.
RETARDATION: THE NEGETIVE ACCELERATION IS KNOWN AS RETARDATION OR NEGETIVE ACCELERATION.
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