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Kevin and Jason are riding identical bicycles to school. The boys both have the same amount of mass. Kevin is traveling at 20 kilometers per hour, whereas Jason is traveling at 15 kilometers per hour.Which of these is true? A. Jason has more kinetic energy than Kevin because Jason is moving at a faster speed. B. Kevin has more kinetic energy than Jason because Kevin is moving at a faster speed. C. Kevin and Jason have the same amount of kinetic energy because they are both in motion. D. Kevin and Jason have the same amount of kinetic energy because they have the same amount of mass.

Question

Kevin and Jason are riding identical bicycles to school. The boys both have the same amount of mass. Kevin is traveling at 20 kilometers per hour, whereas Jason is traveling at 15 kilometers per hour.Which of these is true? A. Jason has more kinetic energy than Kevin because Jason is moving at a faster speed. B. Kevin has more kinetic energy than Jason because Kevin is moving at a faster speed. C. Kevin and Jason have the same amount of kinetic energy because they are both in motion. D. Kevin and Jason have the same amount of kinetic energy because they have the same amount of mass.

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Solution

B. Kevin has more kinetic energy than Jason because Kevin is moving at a faster speed.

This is because kinetic energy is directly proportional to the square of the speed. Since Kevin is moving faster, he has more kinetic energy.

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