A block starts from rest and moves a distance $x$ along a straight slope. The slope makes an angle $\theta$ with the horizontal. The slope is frictionless and air resistance is negligible. The acceleration of free fall is $g$. Which expression gives the block's final speed?
- A$\sqrt{\frac{g x \sin \theta}{2}}$
- B$\sqrt{2 g x \sin \theta}$
- C$\sqrt{2 g x}$
- D$2 g x \sin \theta$