A projectile is launched at an angle to the ground. At a particular moment, the projectile's horizontal velocity is $23.0\,\text{m s}^{-1}$ and its vertical velocity is $-10.1\,\text{m s}^{-1}$. What is the projectile's speed at this moment?
- A$12.9\,\text{m s}^{-1}$
- B$20.7\,\text{m s}^{-1}$
- C$25.1\,\text{m s}^{-1}$
- D$33.1\,\text{m s}^{-1}$