a) State the work-energy theorem. (2 marks) b) A body of mass 5 kg is pulled from rest along a smooth horizontal surface by a constant horizontal force of 20 N. After travelling a distance of 8 m, the body passes over a rough patch of surface of length 2 m where the coefficient of kinetic friction is 0.3. The body then continues on the smooth surface. i) Calculate the work done by the applied force over the entire 10 m distance. (2 marks) ii) Calculate the work done against friction over the rough patch. (3 marks) iii) Calculate the kinetic energy of the body at the end of the 10 m distance. (3 marks) iv) Calculate the speed of the body at the end of the 10 m distance. (2 marks) c) State one practical application of the work-energy theorem in everyday life. (1 mark) [Take g = 10 m/s²]