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A space elevator has an altitude above the Earth's surface of 40,000km. What would be the...

A space elevator has an altitude above the Earth's surface of 40,000km. What would be the kinetic energy of a 1kg mass at the end of our space elevator? What would be the gravitational potential energy of that mass? If the 1kg object fell way down to the Earth's surface, what would be its speed just before impact? (The radius of Earth is 6.4 x 106m)

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This would be the speed just before the impact.

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