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Interplanet Albert has found a new planet that makes him happy, but he wants to learn...

Interplanet Albert has found a new planet that makes him happy, but he wants to learn more about it. He stands on the surface of the planet and drops a small rock from a height of 2.2 m. The rock hits the ground 0.458 s later. If the radius of the planet is 9.2 x 107 m, what is the mass of the planet (in kg)?  

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