An astronaut on the Moon, where there is no air resistance, throws a ball. The ball begins with a velocity that has a vertical component of $8.00\,\text{m s}^{-1}$ and a horizontal component of $4.00\,\text{m s}^{-1}$, as shown. The acceleration of free fall on the Moon is $1.62\,\text{m s}^{-2}$. Determine the speed of the ball $9.00\,\text{s}$ after it has been thrown?
- A$6.6\,\text{m s}^{-1}$
- B$7.7\,\text{m s}^{-1}$
- C$10.6\,\text{m s}^{-1}$
- D$14.6\,\text{m s}^{-1}$