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Your starship, the Aimless Wanderer, lands on the mysterious planet Mongo. As chief scientist-engineer, you make...

Your starship, the Aimless Wanderer, lands on the mysterious planet Mongo. As chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 15.0 m/s returns to the ground in 9.00 s ; the circumference of Mongo at the equator is 3.00×105 km ; and there is no appreciable atmosphere on Mongo.

a) The starship commander, Captain Confusion, asks for the following information: what is the mass of Mongo? Express your answer to three significant figures.

m= 1.14*10^26 kg correct answer

b) If the Aimless Wanderer goes into a circular orbit 2.00×104 km above the surface of Mongo, how many hours will it take the ship to complete one orbit? Express your answer to three significant figures.

t=? (Please help with b)

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