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To learn to use conservation of energy with the Newtonian form for gravitational potential energy. Planet...

To learn to use conservation of energy with the Newtonian form for gravitational potential energy. Planet X, a planet with no atmosphere, has a radius of 5.00×106 m and an unknown mass. You drop an object from rest from a distance of 400 km above the surface and find that it has a speed of 3010 m/s just before it hits the ground.

Solve for the mass of planet X.

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