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Conservative and Non Conservative Forces

A driver incr...

Question

A driver increases the speed of his car on approaching a hilly road. Why is it done?

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Solution

Explanation
When a vehicle is moving on a flat road, it has to do work to overcome the friction of the road and the air resistance but no work is done against the force of gravity.
On the other hand when the vehicle is moving up the hill, then moving forward in addition to friction and air resistance it has to do work against the force of gravity.
Therefore, the drivers increase the speed of vehicles approaching a hilly road.

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