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1.7 Energy, work and power

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Question 102

An electric train is travelling along a straight horizontal track. The train has 12.0 MJ12.0\text{ MJ}12.0 MJ of kinetic energy. The train accelerates for 40 s until its kinetic energy increases to 18.0 MJ18.0\text{ MJ}18.0 MJ.

What is the minimum average power developed by the train's engines for this acceleration?

A

150 W150\text{ W}150 W

B

750 W750\text{ W}750 W

C

150 kW150\text{ kW}150 kW

D

750 kW750\text{ kW}750 kW

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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