A box with a mass of $8.0\,\text{kg}$ is raised from the ground and set on a shelf. As a result, the box gains $100\,\text{J}$ of potential energy. It then drops off the shelf. Air resistance is negligible. At what speed does the box hit the ground?
- A$3.5\,\text{m s}^{-1}$
- B$5.0\,\text{m s}^{-1}$
- C$25\,\text{m s}^{-1}$
- D$28\,\text{m s}^{-1}$