An elevator on a construction site lifts equipment of total mass 400 kg, initially at rest on the ground, with uniform acceleration.
When the equipment is 8.0 m from the ground, its speed is 6.0 m/s.
How much work is done on the equipment during this lifting process? (Take g=9.81 m s−2g = 9.81\text{ m s}^{-2}g=9.81 m s−2)
7.2 kJ7.2\text{ kJ}7.2 kJ
31.4 kJ31.4\text{ kJ}31.4 kJ
38.6 kJ38.6\text{ kJ}38.6 kJ
45.8 kJ45.8\text{ kJ}45.8 kJ
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.