A common automobile engine is 20% efficient. The average retarding force along a road is 1000 N. The energy content of fuel is 40 MJ/L. This automobile can achieve how many kilometers per liter?

A. 10 km/L.
B. 12 km/L.
C. 14 km/L.
D. 8 km/L.

Answer: D

Environmental & Atmospheric Sciences

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