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Q.

[79]

If the velocity of an object increases with time, then it's called a?


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a

Retardation

b

Deceleration

c

Acceleration

d

Momentum  

answer is C.

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Detailed Solution

An increase in velocity with time is called acceleration.
The rate of change of an object's velocity to time is acceleration. Acceleration is a vector quantity (as it has magnitude and direction). SI unit of acceleration is m/s2. The product of the mass and velocity are called momentum. Deceleration is a reversal term for acceleration. Retardation or deceleration occurs when velocity decreases over time. Negative acceleration is commonly known as retardation. It has the same SI unit of m/s2.
 
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