A crate of building supplies weighing 18 000 N18\,000\text{ N}18000 N is lifted vertically upwards through a height of 14 m by a construction crane.
The useful power developed by the crane's electric motor is 1200 W.
Calculate the time taken to lift the crate.
26 exam-style questions on Edexcel GCSE Physics 8.3 Power and efficiency. Each one has a worked solution and a mark scheme showing where the marks go.