A ball is released from rest at the top of a building. Air resistance may be ignored. The ball has a velocity of $14\,\text{m s}^{-1}$ as it reaches the ground. What is the height of the building?
- A$2.9\,\text{m}$
- B$10\,\text{m}$
- C$20\,\text{m}$
- D$40\,\text{m}$