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Q.

If the velocity of an object decreases with time, then it is called


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a

retardation

b

de- acceleration

c

negative acceleration

d

All of the above 

answer is D.

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Detailed Solution

 Acceleration is defined to be the rate of change of the velocity. If acceleration points in the same direction as the velocity, the object will be speeding up. And if the acceleration points in the opposite direction of the velocity, the object will be slowing down. If the velocity of an object decreases with time, it is called retardation.
When the final velocity of the body is less than its initial velocity, it is said to be under retardation. Retardation is commonly known as negative acceleration or deceleration.
 
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