Trabalho e energia: problema com atrito
Vídeo original: https://www.khanacademy.org/science/physics/work-and-energy/work-and-energy-tutorial/v/work-energy-problem-with-friction
06 Feb 2015
Vídeo original: https://www.khanacademy.org/science/physics/work-and-energy/work-and-energy-tutorial/v/work-energy-problem-with-friction
06 Feb 2015
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