Question

A toy is hanging at rest at the end of a spring. The toy is 350 g, and stretches the spring

10 cm. What is the spring constant?

Answer 1

$$F=kx,$$ $$mg=kx,$$ $$k=\dfrac{mg}{x}=\dfrac{0.35\ kg\cdot9.8\ \dfrac{m}{s^2}}{0.1\ m}=34.3\ \dfrac{N}{m}.$$