Question

arrange the objects in order from greatest to least potential energy. assume that gravity is constant (use pe = m g h.)
a 15 - kilogram stone found at a height of 3 meters
10 kilograms of water stored at a height of 9 meters
a 1 - kilogram ball located 20 meters in the air
a box of books with a mass of 25 kilograms placed on a shelf 2 meters high

Explanation:

Step1: Calculate PE for stone

$PE_1 = 15 \times g \times 3 = 45g$

Step2: Calculate PE for water

$PE_2 = 10 \times g \times 9 = 90g$

Step3: Calculate PE for ball

$PE_3 = 1 \times g \times 20 = 20g$

Step4: Calculate PE for book box

$PE_4 = 25 \times g \times 2 = 50g$

Step5: Compare PE values

$90g > 50g > 45g > 20g$

Answer:

1. 10 kilograms of water stored at a height of 9 meters
2. a box of books with a mass of 25 kilograms placed on a shelf 2 meters high
3. a 15-kilogram stone found at a height of 3 meters
4. a 1-kilogram ball located 20 meters in the air