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 2.00×10^5 KM; and there is no appreciable atmosphere on Mongo.
1- The starship commander, Captain Confusion, asks for the following information: what is the mass of Mongo?
2- If the Aimless Wanderer goes into a circular orbit 2.00×10^4 km above the surface of Mongo, how many hours will it take the ship to complete one orbit?