To maintain a constant speed, the force provided by a car’s engine must equal the drag force plus the force of friction of the road (the rolling resistance).
a) What are the drag forces at 70 km/h and 100 km/h for a Toyota Camry?
(Drag area is 0.70 m²)
b) What is the drag force at 70 km/h and 100 km/h for a Hummer H2?
(Drag area is 2.44 m²) Assume all values are accurate to three significant digits.