The spring’s extension/load graph is shown below. The unstretched length of the spring is $15.0\,\text{cm}$. When an object with unknown weight is hung from the spring, the spring’s length becomes $16.4\,\text{cm}$. What weight does the object have?
- A$0.55\,\text{N}$
- B$0.67\,\text{N}$
- C$3.5\,\text{N}$
- D$4.1\,\text{N}$