Consider an airplane with mass 70 000 kg, cross sectional area 12 m², and drag coefficient 0.03. Estimate the energy needed to get the plane moving at 800 km/h and lift the plane to 10000 m, and estimate air-resistance losses for a flight of 2000 km using the formula in the previous problem. Do a rough comparison of the energy used per person to do a similar trip in an automobile, assuming that the plane carries 50 passengers and the automobile carries two people.