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). The density of air is 1.2 kg/m3. (a) What are the drag forces in newtons at 79 km/h and 109 km/h for a Toyota Camry? (Drag area = 0.70 m2 and drag coefcient = 0.28.) at 79 km/h 90.5 x Recall that the drag force is proportional to the square of the velocity. Check for consistency in units. N at 109 km/h 194.5 x Recall that the drag force is proportional to the square of the velocity. Check for consistency in units. N (b) What are the drag forces in newtons at 79 km/h and at 109 km/h for a Hummer H2? (Drag area = 2.44 m2 and drag coefcient = 0.57.) at 79 km/h 400.2 / N at 109 km/h 802.7 X Recall that the drag force is proportional to the square of the velocity. Check for consistency in units. N