Q 1(a) [10 Marks] In order to maintain a uniform speed of 72 km/h on the level, a car of mass 1.5 tonne requires an axle torque of 115 Nm. The wheel diameter is 500 mm. (i) Calculate the tractive resistance. (4 marks) (ii) If while running at 72 km/h, the car climbs a gradient of 1 in 15, Calculate the time taken for the speed to fall to 40 km/h assuming that the tractive resistance increases by 50% and the torque applied to the wheels is maintained unchanged.