A constant force $F$, acting on a car of mass $m$, moves the car up the incline through a distance $s$ at constant velocity $v$. The angle between the incline and the horizontal is $\alpha$. Which expression represents the efficiency of this process?
- A$\dfrac{mg s \sin \alpha}{F v}$
- B$\dfrac{m v}{F s}$
- C$\dfrac{m v^2}{2 F s}$
- D$\dfrac{mg s \sin \alpha}{F}$