Arrange the examples in order, starting with the object that has the least amount of energy at the top and the most amount of energy at the bottom. In each case, assume there’s no friction. Use g = 9.8 m/s², PE = m × g × h.
a. A ball at the top of a hill with a height of 10 meters.
b. A book on a shelf with a height of 2 meters.
c. An apple hanging from a tree branch, 5 meters above the ground.
d. A pencil lying on a table.