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17 October, 13:30

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

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  1. 17 October, 13:35
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    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.
  2. 17 October, 13:40
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    At 60 mph. The 18-wheeler is moving slower, so its molecules have less kinetic energy.
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