An astronaut on the Moon, where air resistance is absent, throws a ball. The ball initially has 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 Moon’s acceleration of free fall is $1.62\,\text{m s}^{-2}$. What is the speed of the ball $9.00\,\text{s}$ after it is thrown?
- A$6.58\,\text{m s}^{-1}$
- B$7.70\,\text{m s}^{-1}$
- C$10.6\,\text{m s}^{-1}$
- D$14.6\,\text{m s}^{-1}$