The rolling resistance of a vehicle can be calculated as F = crmg where m is the mass of the vehicle, g is the acceleration due to gravity, and cr is the coefficient of rolling resistance. How much more fuel is needed for a van to overcome rolling resistance than a car if the mass of the vehicles are mvan = 2,050 kg and mcar = 1,500 kg and each car drives a distance of 300 km? (report your result in the unit of liters, L) Assume that cr = 0.02, that the energy density of gasoline is 36000 kJ/L, and that the efficiency of the engine in each vehicle is 25%. Your