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Your uncle works at the railroad freight yard, and he has asked you to watch the yard hands couple 20,000-kg boxcars together. As he leaves

Your uncle works at the railroad freight yard, and he has asked you to watch the yard hands couple 20,000-kg boxcars together. As he leaves to get a sandwich, he tells you, "Whatever you do, don't let those cars bang together too hard. The coupling between the cars will take only 8,000 J on a hit before it shatters." You ask how hard is too hard, but your uncle has already ducked out.

How fast can one moving car bump into a stationary car without the coupling shattering (find Vmax)?

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