A constant force $F$, applied to a car of mass $m$, lifts the car along a slope for a distance $s$ with constant speed $v$. The angle between the slope and the horizontal is $\alpha$. Which expression represents the efficiency of the process?
- A$\frac{mg s \sin \alpha}{Fv}$
- B$\frac{mv}{Fs}$
- C$\frac{mv^2}{2Fs}$
- D$\frac{mg \sin \alpha}{F}$