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GK QUESTION#3052

If the speed of an object of fixed mass is tripled, how does its classical kinetic energy change?

  1. AIt becomes 9 timesCorrect answer
  2. BDoubles
  3. CQuadruples
  4. DIncreases fivefold
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Answer

A. It becomes 9 times

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Explanation

At fixed mass, kinetic energy is proportional to speed squared. Replacing speed v by 3v multiplies mv²/2 by 3² = 9, so the kinetic energy becomes nine times its original value.

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