Question

3. --------- is an example of positive acceleration. 



A stone is thrown vertically upwards

A stone falls freely towards the earth

Brakes are applied by the truck driver

The train arriving at the station

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Answer 1

Answer:

A stone falls freely towards the earth.

Earth attracts the stone fastly when it falls down.

Answer 2

Answer:

A stone falls freely towards the earth.

Explanation :

• An object has positive acceleration if it is accelerating and travelling in the right direction.
• When an object accelerates and moves in the right direction, it is travelling faster.
• Positive acceleration was demonstrated in the first example by the speeding car.
• The acceleration is occurring in the same direction as the car's motion, which is forward and speeding up.
• In case of a stone falling freely, the force which is acting on it is gravitational force which is attractive in nature and attracting the stone towards it, so the stone is speeding up and hence, the acceleration will be positive and it's value will be 9.8 m/s.

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