An astronaut is on the Moon, where there is no air resistance, and throws a ball. The ball starts with a vertical velocity component of $8.00\ \text{m s}^{-1}$ and a horizontal velocity component of $4.00\ \text{m s}^{-1}$, as shown. The acceleration of free fall on the Moon is $1.62\ \text{m s}^{-2}$. What is the ball’s speed $9.00\ \text{s}$ 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$14.6\ \text{m s}^{-1}$