One end of a spring is held in place. A tensile force $F$ is applied to the other end, causing the spring length $L$ to increase. The graph shows how $L$ varies with $F$. What is the elastic potential energy stored in the spring when $F$ is $6.0\,\text{N}$?
- A$0.12\,\text{J}$
- B$0.24\,\text{J}$
- C$0.36\,\text{J}$
- D$0.60\,\text{J}$