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What is the velocity of an 500-kilogram elevator that has 4,000 joules of energy?

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[tex]E=\frac{mv^2}2 \\ 2E=mv^2 \\ v^2=\frac{2E}m \\ v=\sqrt\frac{2E}m \\ v=\sqrt\frac{8000}{500} \\ v=\sqrt{16} \\ v=4[/tex]
4 meters per second.

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