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An 18-wheeler reaches a speed of 70 mph, then slows to 60 mph. At which speed does it have the least kinetic energy?

User Yanirys
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2 Answers

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Step-by-step explanation:

An object that has motion - whether it is vertical or horizontal motion - has kinetic energy. ... This equation reveals that the kinetic energy of an object is directly proportional to the square of its speed. That means that for a twofold increase in speed, the kinetic energy will increase by a factor of four.

User JustMe
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At 60 mph. The 18-wheeler is moving slower, so its molecules have less kinetic energy.

User Thomas Langston
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