You machine that tells you exactly how much work in joules is put into a machine and how much work produced. the reading that you just received from the machine state that the input work was 345 joules and the output work was 330 joules. the law of conservation of energy states that input should equal output. how can you explain the "lost" 15 joules

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.