Devin is watching two runners at the park. The runners are the same weight, and the speed that each of them is running is not changing.Devin wants to know which runner has the most energy of motion. What would he need to find out about the runners in order to determine this? A. the speed that they are running B. the direction that they are running C. the distance that they are running D. the location that they are running to
Question
Devin is watching two runners at the park. The runners are the same weight, and the speed that each of them is running is not changing.Devin wants to know which runner has the most energy of motion. What would he need to find out about the runners in order to determine this? A. the speed that they are running B. the direction that they are running C. the distance that they are running D. the location that they are running to
Solution
Devin would need to find out about the speed that they are running (Option A). The energy of motion, also known as kinetic energy, depends on both the mass and speed of an object. Since the runners have the same weight (mass), the one running at a higher speed will have more kinetic energy. The direction, distance, and location they are running to do not affect the kinetic energy.
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