A car with mass $800\,\text{kg}$ moves up a hill of height $h$. When it reaches the top, the car has increased its gravitational potential energy by $40\,000\,\text{J}$. The gravitational field strength $g$ is $10\,\text{N kg}^{-1}$. What is the height $h$ of the hill?
- A$5.0\,\text{m}$
- B$20\,\text{m}$
- C$50\,\text{m}$
- D$500\,\text{m}$