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I get slightly less, but that should be close enough. Maybe you used a larger value for g.DeepPatel said:
Sledding Down a Hill: Calculating Friction and Velocity
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The discussion revolves around calculating the work done by friction and the final velocity of a man sledding down a hill. The sledder, weighing 75 kg, starts from a height of 20 m with an initial speed of 7 m/s and experiences a friction force of 22 N. Participants clarify the use of the work-energy principle, emphasizing the need to account for both potential and kinetic energy, as well as the negative contribution of friction to the total mechanical energy. After correcting initial miscalculations, the work done by friction is determined to be 880 J, leading to a final speed of approximately 20.549 m/s when adjusted for the negative work. The conversation highlights the importance of careful application of physics equations and the physical interpretation of results.