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Work, Power and Energy: Power — Engine MCQ

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Power — EngineMediumQuestion 30423

Question

A 1000 kg car accelerates from 0 to 20 m/s in 10 s on a frictionless road. Average power of the engine is:
  1. A
    20 kW
    Correct
  2. B
    10 kW
  3. C
    2 kW
  4. D
    40 kW

Correct answer

20 kW

Explanation

W = ΔKE = ½×1000×400 = 200000 J. P_avg = W/t = 200000/10 = 20000 W = 20 kW.

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