Two workers unload a 100 kg bed frame from a truck whose bed is 1.04 m above the ground. They carry it up 5 flights of stairs (each flight is 2.5 m tall) to Larry's apartment. When they get there, Larry tells them that
he never ordered a bed frame. After some confusion and heated words, the workers take the bed frame
back down the stairs and put it back on the truck.
Calculate the net work done by the workers on the bed in this process. Report you answer to the nearest kJ.