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8.3 Exercise 21

Avg difficulty 2.5

A sled of mass 70 kg starts from rest and slides down a 10°10 ° incline 80m80 \text{m} long. It then travels for 20 m horizontally before starting back up an 8°8 ° incline. It travels 80 m along this incline before coming to rest. What is the magnitude of the net work done on the sled by friction?

OpenStax University Physics Volume 1, 8.3 Conservation of Energy, exercise 21

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Adapted from University Physics Volume 1 © 2016 Rice University. Licensed under CC BY 4.0. Source: University Physics Volume 1. Imported at revision db44eb9.