An object with a mass of $20\,\text{kg}$ is lifted up some stairs by a vertical height of $4.0\,\text{m}$. What is the gain in gravitational potential energy stored?
- A$5.0\,\text{J}$
- B$49\,\text{J}$
- C$80\,\text{J}$
- D$780\,\text{J}$
Physics 0625 · IGCSE · Energy, work and power