Positive, negative and zero acceleration
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A positive acceleration means an increase in velocity with time. negative acceleration means the speed reduces with time. its a retardation. If the speed is increasing, the car has positive acceleration. When the car slows down, the speed decreases.
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When the velocity of an object increases, the acceleration is positive.In this case, the acceleration is in the direction of Velocity. When the velocity of an object decreases with time,it has negative Acceleration. ... If the velocity of the object does not change with time,it has zero acceleration
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