Drag each tile to the correct box. Arrange the objects in order from least to greatest potential energy. Assume that gravity is constant. (Use PE = m × g × h.)

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