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

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E=\frac{mv^2}2 \\ 2E=mv^2 \\ v^2=\frac{2E}m \\ v=\sqrt\frac{2E}m \\ v=\sqrt(8000)/(500) \\ v=√(16) \\ v=4
4 meters per second.
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