Physics
Vehicle tyres are inflated properly

To avoid skidding and to minimise friction
To ensure smooth running.
To allow the vehicle to take more load.
To go fast and save fuel.

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Physics
It is easier to roll a stone up a sloping road than to lift it vertical upwards because

Work done in lifting the stone is equal to rolling it.
Work done in rolling is more than in lifting.
Work done in both is same but the rate of doing work is less in rolling.
Work done in rolling a stone is less than in lifting it.

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