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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 Unpublished doctoral thesis.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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when it collides into Car 2, which was at rest. After the collision, Car 2 moves at 
and Car 1 moves at 
. If Car 1 weighs 0.05 kg, how much does Car 2 weigh?