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20. 11. Four Earths 11a Four earth-like planets each have a mass of 6 x 1024 kg. They are arranged on a square with

20. 11. Four Earths 11a Four earth-like planets each have a mass of 6 x 1024 kg. They are arranged on a square with 1 x 10 m sides and orbit in a perfect circle as seen here (not to scale): What is their orbital speed in m/s?

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