How much does the vertical load on each rear tire increase at 72kph when the wing shown in the sketch is used vs. running without wing? density = 1.2 kg/m^3 Wheelbase = 1.6m Wing: cl*A = 0.6 m² cd*A = 0.3m² yW = 0.8m zW = 0.4m zs = 0.3m Static weight distribution = 51% rear ignore wing weight car is completely stiff

1. 7.0 kg
2. 8.0 kg
3. 10.0 kg
4. 9.0 kgCorrect

Official answer

9.0 kg