A lorry has a mass of 10 tonnes (one tonne equals 1000kg) and a surface area of 6.3m2. Its aerodynamic drag coecient is measured to be 0.530. Assume the drag force is proportional to v2, given by F = 1/2DρAv2 and ignore other sources of resistive force. a) Find the power required to maintain a speed of 60km/h on a flat, straight road. b) Find the power required to maintain a speed of 80km/h on the same flat, straight road. c) If the energy yield of diesel fuel is the same at either speed, how much more in percent does it cost to go one kilometre at 80km/h relative 60km/h?

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