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The natural force at work on your vehicle hills are?

The natural force at work on your vehicle when going up or down hills is gravity. Gravity is the force of attraction between any two objects with mass, and it is always pulling objects towards the center of the Earth. When you are driving uphill, gravity is working against you, and you have to use your engine to overcome the force of gravity in order to move forward. When you are driving downhill, gravity is working with you, and it helps you to accelerate. However, you still need to use your brakes to control your speed and prevent yourself from going too fast.