Julie is holding a 5 kg book 1 m above the ground, Bob is holding a 10 kg book 2 m above the ground and Anna is holding a 7.5 kg book 1 m above the ground. All three students hold their book steady without moving for 5 minutes. Rank from greatest to least the amount of work being done by each person during this 5 minute period. (use > to indicate one value is greater than another, use
