A car of mass 900 kg is towing a trailer of mass 100 kg along a horizontal road. There are resistance forces of 60 N and 20 N acting on the car and the trailer respectively. (a) The engine applies a driving force of 480 N. Calculate (i) the acceleration of the car and trailer (ii) the tension in the towbar. (b) The brakes are now applied, bringing the car to a halt from a speed of 10 ms in a distance of 50 m. Find (i) the magnitude of the braking force (ii) the force in the towbar. (4) (6)