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QuestionMan
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QuestionMan
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These are so annoying with lots of complicated steps
A railway wagon with a mass of 20 tonnes is moving along a level track at 10 km/h when it collides and couples together with a second wagon with a mass of 25 tonnes moving in the same direction at 5km/h. If the two wagons couple together after the impact,
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QuestionMan
Jan 16, 2017