An electric tug pulls a line of loaded baggage trolleys a distance of 18 m along level ground. The tug exerts a constant force of 120 N on the trolleys in their direction of motion.
During this journey, 3.0 kJ of energy is supplied to the tug.
Calculate the efficiency of the electric tug.
128 exam-style questions on Edexcel GCSE Physics 8.3 Power and efficiency, covering 8.3.1 Power and 8.3.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.