A 1200 kg car climbs a 2 % gradient at a steady 20 m/s in still air. Rolling-resistance coefficient 0.015; air density 1.20 kg/m^{3}; drag coefficient 0.30; frontal area 2.0 m^{2}; g = 9.81 m/s^{2}. Take cos θ ≈ 1 and sin θ ≈ 0.02. Find (a) the tractive effort required in N and (b) the wheel power in kW.