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Homework Statement
A car's engine is 20% efficient. When cruising, the car encounters an average retarding force of 1000 N. If the energy content of gasoline is 40 megajoules per liter, how many kilometers per liter does the car get?
The Attempt at a Solution
What I tried to do it divide 40 MJ per liter by 1000 N = 40000 meters. I then converted to km per liter which gave me 40km per liter. I think multiplied by 20% and got 8 km per liter. I am not quite sure if this was the right method.