b A car of mass 950 kg travels along a horizontal road at a speed of 30 km h\". At this speed, the air resistance is 90 N and the total fonnrard (driving) force is 170 N. Figure 2 shows the horizontal forces acting on the car. 'ITU N Figure 2 i Calculate the acceleration of the car at 30 km h'1. acceleration = .................................... m 32 (2 marks}