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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 Unpublished doctoral thesis.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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. It collides with a 150kg car that was at rest. Following the collision, the second car moves with a velocity of 
west. Assuming that the collision is elastic, what is the velocity of the first car after the collision?