How much work is done to move a 6kg Christmas cake from the bottom shelf to.the refrigerator ( 0.5m high) to the top shelf (1.5m high)
The height change is
H = 1.5 - 0.5 = 1.0 m
The work required is
W = M g H
H = 1.5 - 0.5 = 1.0 m
The work required is
W = M g H