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1.7 Energy, work and power

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Question 14

A speedboat is moving across a straight stretch of water. The speedboat has 1.2 MJ1.2\text{ MJ}1.2 MJ of kinetic energy. It accelerates for 25 s until its kinetic energy increases to 3.0 MJ3.0\text{ MJ}3.0 MJ.

What is the minimum average power developed by the speedboat's engine during this acceleration?

A

72 W72\text{ W}72 W

B

168 W168\text{ W}168 W

C

72 kW72\text{ kW}72 kW

D

168 kW168\text{ kW}168 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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