A constant force $F$ acts on a car of mass $m$ and moves the car up the slope by a distance $s$ at constant velocity $v$. The slope 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$\frac{m g \sin \alpha}{F}$