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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 Unpublished doctoral thesis.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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, what is the length of the string?
with a mass of 
attached to the end of the spring. If the spring is stretched 
passed its point of equilibrium and released, how many times does the mass pass through equilibrium per minute?