A tensile force of $7.00\,\text{MN}$ is exerted on a steel sample. As a result, the sample increases in length by $5.00\,\text{mm}$ along the line of the force. The sample obeys Hooke’s law. What amount of work is done in extending the sample?
- A$17.5\,\text{J}$
- B$35.0\,\text{J}$
- C$17.5\,\text{kJ}$
- D$35.0\,\text{kJ}$