An experiment is performed to find the spring constant of a spring. A series of different loads is suspended from the spring, and the length is measured for each load. The graph shows how the length changes with load. What is the value of the spring constant?
- A$0.20\,\text{N cm}^{-1}$
- B$0.25\,\text{N cm}^{-1}$
- C$4.0\,\text{N cm}^{-1}$
- D$5.0\,\text{N cm}^{-1}$