Determine (a) the power required to overcome the aerodynamic drag and (b) rolling resistance for a truck traveling at a velocity of 120 km/h, if cd = 0.8, A = 10 m2, ρ = 1.2 kg/m3, f = 0.01, and m = 20,000 kg. Plot the power requirement - aerodynamic, rolling friction and total - against velocity within the range from 0 to 200 km/h.