The graph illustrates the way the length of a spring varies as the stretching force is raised. Within the Hooke’s law region, what is the spring constant of this spring?
- A$0.20\,\text{N cm}^{-1}$
- B$0.22\,\text{N cm}^{-1}$
- C$0.28\,\text{N cm}^{-1}$
- D$0.33\,\text{N cm}^{-1}$