What happens to the kinetic energy of a race car if its speed is tripled?

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Correct Answer: **D.** *The kinetic energy increases to 9 times its original value.*

Kinetic energy is: KE = (1/2)mv^{2}. The kinetic energy is directly proportional to the square of the velocity (or speed). If the speed is multiplied by 3 (tripled), the KE must be multiplied by 3^{2} = 9. Sidenote, race car spelled backwards is still race car.

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