Rawly has a mass of 79.0 kg, and he is sledding down a hill that is 29.5 m tall. As he goes down the hill, his gravitational potential energy is converted into kinetic energy. When he has descended 21.0 m down the hill, how much kinetic energy and gravitational potential energy does he have? A. GPE=16,300 J; KE=6590 J. B. GPE=6590 J; KE=16300 J. C. GPE=22900 J; KE=6590 J. D. GPE=0 J; KE= 22900 J

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 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 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? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?