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Problem 3 The retarding force, FD, on a car can be repre- sented by To simplify the math, assume that ai - 0. A new electric car is being tested by driving it on a perfectly horizontal road on a windless day. The test consists of driving the vehicle at constant speed and measuring the energy used up from the battery. Exactly 15 kWh of energy is used in each case. When the car is driven at a constant 100 km/h, the distance covered is 200 km. When the speed is reduced to 60 km/h, the distance is 362.5 km. If the effective frontal area of the car is 2.0 m2, what is the coefficient of aerodynamic drag of the vehicle vehicle?

engineering   Mechanical-Engineering   
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0 Energy 1s - V too kmhr (360o (to,o 60 6400

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