A body is falling freely. The change in its gravitational potential energy depends on its mass $m$, the change in height $\Delta h$ and the gravitational field strength $g$. Which expression gives the change in gravitational potential energy correctly?
- A$gm\Delta h$
- B$\frac{gm}{\Delta h}$
- C$\frac{g\Delta h}{m}$
- D$\frac{m\Delta h}{g}$