Respuesta :

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

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.

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