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¹ Lee, J.Y. (2013). “Private tutoring and its impact on students' academic achievement, formal schooling, and educational inequality in Korea.” Unpublished doctoral thesis. Columbia University.
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. If the crate has a mass of 20kg and the coefficient of kinetic friction between the crate and the floor is 0.2, how much power is the man exerting?
. What is the man's power output?