A biomedical engineer is testing the elastic properties of a newly developed synthetic ligament fiber for reconstructive surgery.
The engineer subjects a sample of the fiber to various tensile forces and records the resulting extension. The graph below displays the results of the tension test within the fiber's elastic region.
Calculate the stiffness (spring constant) of the synthetic ligament fiber in N m−1\text{N}\,\text{m}^{-1}Nm−1.