A car of mass $m$ is pulled uphill over a distance $s$ at constant speed $v$ by a constant force $F$. The incline makes an angle $\alpha$ with the horizontal. Which expression gives the efficiency of the process?
- A$\frac{m g s \sin \alpha}{F v}$
- B$\frac{m v}{F s}$
- C$\frac{m v^{2}}{2 F s}$
- D$\frac{m g \sin \alpha}{F}$