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Question:

How does the weight of the vehicle affect stopping distance?

A Empty trucks take longer to stop than if loaded, but this is not the normal case for buses.
Explaination

The heavier the vehicle, the more work the brakes must do to stop it, and the more heat they absorb. But the brakes, tires, springs, and shock absorbers on heavy vehicles are designed to work best when the vehicle is fully loaded. Empty trucks require greater stopping distances because an empty vehicle has less traction.