A 220 kg stone thrown upward from the ground at 100ms, Ask an Expert

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A 2.20 kg stone thrown upward from the ground at 10.0m/s returns to the ground in 8.00; the circumference of Mongo at the equator is and 1.80 × 10^5 km; and there is no appreciable atmosphere on Mongo. The starship commander, Captain Confusion, asks for the following information:

What is the mass, in kg, of Mongo?

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