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1.7 Energy, work and power

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Question 62

A car of mass 800 kg is moving at 15 m/s. The engine does work on the car and the speed increases to 25 m/s.

How much work is done by the engine to increase the speed of the car?

A

40 000 J40\,000\text{ J}40000 J

B

80 000 J80\,000\text{ J}80000 J

C

160 000 J160\,000\text{ J}160000 J

D

320 000 J320\,000\text{ J}320000 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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