If you double the speed of a car, the amount of kinetic energy in a crash:
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Doubles.
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Stays the same.
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Triples.
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Quadruples.
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Explanation
When drivers double the speed of their car, they increase its impact force, or kinetic energy, by four times. If they triple their speed, the kinetic energy increases nine times. By law, drivers aren't allowed to speed; they must obey the posted speed limit and adjust their speed according to weather, road, and traffic conditions. Driving at a safe speed reduces the likelihood and severity of crashes.
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This question appears in the following DMV practice tests: