A rock with weight $50\,\text{N}$ drops through a vertical height of $7.0\,\text{m}$ from rest. What is the change in the gravitational potential energy store of the rock?
- Adecrease of $7.1\,\text{J}$
- Bdecrease of $350\,\text{J}$
- Cincrease of $7.1\,\text{J}$
- Dincrease of $350\,\text{J}$