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23 Nov 2019
A runner reaches the top of a hill with a speed of 6.5 m/s. He descends 50 m and then ascends 28 m to the top of the next hill. His speed is now 4.5 m/s. The runner has a mass of 82 kg. The total distance that the runner covers is 386 m, and there is a constant resistance to motion of 9.4 N. Use energy considerations to find the work done by the runner over the total distance.
A runner reaches the top of a hill with a speed of 6.5 m/s. He descends 50 m and then ascends 28 m to the top of the next hill. His speed is now 4.5 m/s. The runner has a mass of 82 kg. The total distance that the runner covers is 386 m, and there is a constant resistance to motion of 9.4 N. Use energy considerations to find the work done by the runner over the total distance.
