A spring with an unextended length of $40\,\text{mm}$ is hung from a fixed point. A load of $16\,\text{N}$ is then placed on the spring’s free end. As a result, the spring stretches until its final length becomes five times its original length. The spring follows Hooke’s Law. What is the energy stored in the spring due to this extension?
- A$1.3\,\text{J}$
- B$1.6\,\text{J}$
- C$2.6\,\text{J}$
- D$3.2\,\text{J}$