A mass moves repeatedly up and down on a steel spring. The diagram shows the mass and the spring at various positions during this motion. At which position is the gravitational potential energy store of the mass the smallest, and at which position is the elastic energy store of the spring the greatest?
- Aleast: mass moving down; most: mass moving up
- Bleast: mass moving down; most: lowest point
- Cleast: lowest point; most: mass moving up
- Dleast: lowest point; most: lowest point