A crane lifts a heavy cargo container vertically upwards.
In which of the following cases does the crane do the most work on the container?
The crane lifts the container 4.0 m4.0\text{ m}4.0 m in 10 s10\text{ s}10 s.
The crane lifts the container 5.0 m5.0\text{ m}5.0 m in 50 s50\text{ s}50 s.
The crane holds the container stationary at a height of 2.0 m2.0\text{ m}2.0 m for 120 s120\text{ s}120 s.
The crane holds the container stationary at a height of 8.0 m8.0\text{ m}8.0 m for 10 s10\text{ s}10 s.
533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.