A $120\,\text{kN}$ load is applied to the top of a metal column. This causes the column’s length to decrease by $0.25\,\text{mm}$. The column follows Hooke’s law while it is being compressed. How much energy is stored in the compressed column?
- A$15\,\text{J}$
- B$30\,\text{J}$
- C$15\,\text{kJ}$
- D$30\,\text{kJ}$