Question

A 14.6-kN vehicle (CD = 0.30, Af = 2.6 m 2 , ρ = 1.2356 kg/m3 ) is driven on a surface with a coefficient of adhesion of 0.4, and the coefficient of rolling friction is approximated as 0.018 for all speeds. Assuming minimum theoretical stopping distances, if the vehicle comes to a stop 82 m after brake application on a level surface and has a braking efficiency of 0.82, what was its initial speed (a) if aerodynamic resistance is considered and (b) if aerodynamic resistance is ignored?

Answer 1