A warehouse uses either a conveyor belt or a cargo lift to raise a heavy crate from the ground floor to a storage mezzanine. The conveyor belt takes 15 s to carry the crate between the two floors. The useful work done against gravity is W W\,W and the useful power developed is PPP. The cargo lift takes 10 s to carry the same crate between the same two floors.
Which option correctly describes the useful work done against gravity by the cargo lift, and the useful power developed by the cargo lift?
Useful work is WWW, useful power is more than PPP.
Useful work is WWW, useful power is less than PPP.
Useful work is more than WWW, useful power is more than PPP.
Useful work is more than WWW, useful power is PPP.
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.