A spring is $25\text{ cm}$ long when a load of $2.0\text{ N}$ is hung from it. When a $7.0\text{ N}$ load is applied, the spring’s length becomes $35\text{ cm}$. What is the spring constant of the spring?
- A$0.20\text{ N/cm}$
- B$0.50\text{ N/cm}$
- C$2.0\text{ N/cm}$
- D$5.0\text{ N/cm}$