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QUESTION
20kg ball, hanging from the ceiling by a light wire 140cm long, is struck in an elastic collision by a 1.40kg ball moving horizontally at 6.00m/s...
An 7.20kg ball, hanging from the ceiling by a light wire 140cm long, is struck in an elastic collision by a 1.40kg ball moving horizontally at 6.00m/s just before the collision.
