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1.7 Energy, work and power

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Question 376

A worker carries 15 building blocks from the ground to a platform. Each block has a mass of 2.4 kg. The platform is 12 m above the ground.

How much work does the worker do against gravity on the blocks in carrying them to the platform?

Take the acceleration of free fall to be g=9.81 m/s2g = 9.81\text{ m/s}^2g=9.81 m/s2.

A

280 J280\text{ J}280 J

B

430 J430\text{ J}430 J

C

4200 J4200\text{ J}4200 J

D

4300 J4300\text{ J}4300 J

Markscheme

1.7 Energy, work and power Questions

  1. IGCSE
  2. /Physics
  3. /1.7 Energy, work and power

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.

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