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Work, Power and Energy: Power — Speed Relation MCQ

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Power — Speed RelationMediumQuestion 30446

Question

A car engine delivers constant power P on a level road. As speed increases, acceleration:
  1. A
    Remains constant
  2. B
    Increases
  3. C
    Decreases
    Correct
  4. D
    Becomes zero always

Correct answer

Decreases

Explanation

P = Fv. At constant P, F = P/v decreases as v increases. Since F = ma, acceleration a = P/(mv) also decreases with speed.

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