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BDifficulty 1/5

At the same initial speed and reaction time, if the wet surface provides less grip than the dry one, when will stopping distance be greater?

Correct answer

On the lower-grip wet surface.

On the lower-grip wet surface, because braking distance increases. Stopping distance is the sum of reaction and braking distances: they are not synonyms. The question holds initial speed and reaction time equal to compare grip; not every rainy situation necessarily has a longer stopping distance than a dry situation at a different speed. Moderate speed and increase safety margins.

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  • On the higher-grip dry surface.

  • It will be identical, because grip does not affect braking.

  • On the lower-grip wet surface.

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