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Two \(5000-\mathrm{kg}\) freight cars full without fraction (one at I \(\mathrm{m} / ...

Two \(5000-\mathrm{kg}\) freight cars full without fraction (one at I \(\mathrm{m} / \mathrm{s}\), the other at \(2 \mathrm{~m} / \mathrm{s})\) toward each other on a level track. Thus one car's kinetic energy is \(2500 \mathrm{~J}\) and the other's is \(10,000 \mathrm{~J}\). Before they collide their total kinetic energy is ____________

A. 1250J
B. 2500J
C. 7500J
D. 12,500J





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