From the top of a building, a boy throws a stone with a horizontal velocity of $10\,\text{m s}^{-1}$. The building is $8.0\,\text{m}$ high. The stone follows a curved path before striking the horizontal ground, as shown. Air resistance is negligible. Calculate how long the stone takes to reach the ground.
- A$0.61\,\text{s}$
- B$0.80\,\text{s}$
- C$1.3\,\text{s}$
- D$1.6\,\text{s}$