Two piles of heavy boxes must be lifted onto a shelf. each pile has 20 boxes and each box is the same size and weight. tom and claudia are each responsible for a pile. tom lifts each box straight up from the pile to the shelf. claudia places a long gradual ramp that leads from pile to the shelf. she pushes each box up the ramp until it rests on the shelf. who used more force

chemical energy --> gravitational potential energy --> kinetic energy --> elastic potential energy --> gravitational potential energy

explanation:

when emma starts the hike, the chemical energy stored in her body is used to climb up the mountain, and so she gains gravitational potential energy (because at the end, she will be at a higher height h above the ground). then she goes bungee jumping: as she falls, this gravitational potential energy is converted into kinetic energy (because her speed increases as she falls down), until the point when the rope stretches, and she stops moving. at that moment, all the kinetic energy is converted into elastic potential energy due to the stretching of the rope. then, this energy is released because the rope returns to its natural length, and emma gains a small increase in altitude , so she gains some gravitational potential energy.