A spring is extended across a range for which elastic deformation takes place. Its spring constant is $3.0\,\text{N cm}^{-1}$. Which row gives the correct extension and strain energy for the stated applied force?
- Aforce $3.0\,\text{N}$, extension $1.0\,\text{cm}$, strain energy $1.5\,\text{mJ}$
- Bforce $6.0\,\text{N}$, extension $2.0\,\text{cm}$, strain energy $120\,\text{mJ}$
- Cforce $12.0\,\text{N}$, extension $3.0\,\text{cm}$, strain energy $180\,\text{mJ}$
- Dforce $24.0\,\text{N}$, extension $8.0\,\text{cm}$, strain energy $960\,\text{mJ}$