A box is lifted vertically 1.5 m and is then held there. The box has a weight of 100 N. Ignore friction. How much work is being done lifting the box? 150 J

50 J

100 J

0 J

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.