Two globs of molten rock are in outer space. One glob has a mass of 2,400 kilograms and is moving at a velocity of 680 meters per second directly toward the second glob. The second glob is at rest. The two globs collide in a perfectly inelastic collision—sticking together. If the velocity of the new mega-glob is 90 m/s, what was the original mass of the second glob? A. 318 kg B. 213,600 kg C. 15,733 kg D. 15,708 kg

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.