The earth has a mass 5.89 x 1024 kg and the moon has a mass 7.36 x 1022 kg. If the distance between the center of the earth and the center of the moon is 3.84 x 105 km, how far from the center of the earth is the center of mass of the earth-moon system?

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.