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 11.0 m/s
returns to the ground in 4.80 s
; the circumference of Mongo at the equator is 2.00×105km
; and there is no appreciable atmosphere on Mongo. If the Aimless Wanderer goes into a circular orbit 40,000 km above the surface of Mongo, how many hours will it take the ship to complete one orbit?
Express your answer in hours to three significant figures.