Question
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 magnitudes of drag forces at 70 km/h and 100 km/h for a Toyota Camry? (Drag area is $0.70 \textrm{ m}^2$) (b) What is the magnitude of drag force at 70 km/h and 100 km/h for a Hummer H2? (Drag area is $2.44 \textrm{ m}^2$) Assume all values are accurate to three significant digits.

a) $44.8 \textrm{ N}$, $91.5 \textrm{ N}$

b) $357 \textrm{ N}$, $729 \textrm{ N}$

Solution Video