def estimate_f_coefficients(my_car, passengers=0):
    """
    f0, f1, f2 coefficients of resistance are estimated

    :param my_car:
    :param passengers:
    :type passengers: int
    :return:
    """
    d = {}
    d['cabriolet'] = 0.28
    d['sedan'] = 0.27
    d['hatchback'] = 0.3
    d['stationwagon'] = 0.28
    d['suv/crossover'] = 0.35
    d['mpv'] = 0.3
    d['coupé'] = 0.27
    d['pick-up'] = 0.4
    rolling_res_coef = 0.009
    theor_aero_coeff = d[my_car.type_of_car]
    operating_mass = my_car.veh_mass + 100 + 75 * passengers
    f0 = (operating_mass + 100) * rolling_res_coef * 9.81
    f2 = 0.5 * 1.2 * (0.84 * my_car.car_width * my_car.car_height *
        theor_aero_coeff) / pow(3.6, 2)
    f1 = -71.735 * f2 + 2.7609
    return f0, f1, f2
