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# Give an example of negative acceleration from daily life situation.

Answer :

Negative acceleration is nothing but retardation.

Acceleration is rate of change of velocity.

But, negative acceleration means that the rate of change of velocity is negative or velocity decreases.

**Example:**

1) When we apply brakes in a moving car, then negative acceleration acts on it and the car stops.

2) When we throw a ball upwards, then also negative acceleration acts on it. Thus when the ball reaches the highest point, velocity of the ball becomes zero.

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Given figures represent the motion of two objects P and Q. Which of the objects has positive acceleration and which one has negative acceleration?

Fill in the blanks.

(i) ………..is the term used for negative acceleration.

(ii) A bus starting from rest attains a velocity of 54 km/h in 60 s, its acceleration is …………….. .

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