• A 1984 Ford Escort traveling at 50 mi/h experiences a drag force, because of rolling friction and air resistance, of about 360 N (roughly, 80 lb).* The energy released by 1 liter of gasoline is about 3.2 × 107 J and is used with about 18% efficiency. How far can the car travel on 1 liter of gasoline at 50 mi/h? Convert your answer to miles per gallon. (1 mi = 1.6 km, 1 gal = 3.8 liters.)
* E.J. Horton and W.D. Compton, Science, vol. 225, p. 587 (1984)
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