According to the condensation theory, the most important factor for the formation of our planets was the gravitational pull of the sun the interstellar dust attracting heat away from the protosun the process of nuclear fusion the nebular cloud condensing

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.