A powered vehicle lift takes 0.50 minutes0.50\ \mathrm{minutes}0.50 minutes to raise a 1200 kg car through a vertical height of 1.5 m. During this time, the mean input power of the lift is 800 W. Gravitational field strength is 10 N/kg. What is the efficiency of the lift?
0.750.750.75
0.0750.0750.075
1.331.331.33
0.250.250.25
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.