A spring starts off with no compression and no extension. A force may be applied to it so that it becomes shorter by compression or longer by extension. What is the change in the elastic potential energy stored in the spring when it is extended and when it is compressed?
- Aspring is extended: decreases; spring is compressed: decreases
- Bspring is extended: decreases; spring is compressed: increases
- Cspring is extended: increases; spring is compressed: decreases
- Dspring is extended: increases; spring is compressed: increases