Physics 9702 · AS & A Level · Energy conservation

Energy conservation — practice question

Which derivation of the equation connecting power, force and velocity is correct?

  • Apower $=\dfrac{\text{work done}}{\text{time taken}}$ and work done $=$ force $\times$ displacement, so power $=$ force $\times$ velocity
  • Bpower $=\dfrac{\text{work done}}{\text{time taken}}$ and work done $=$ force $\times$ distance, so power $=$ force $\times$ velocity
  • Cpower $=\dfrac{\text{work done}}{\text{time taken}}$ and work done $=\dfrac{\text{force}}{\text{displacement}}$, so power $=\dfrac{\text{force}}{\text{velocity}}$
  • Dpower $=\dfrac{\text{work done}}{\text{time taken}}$ and work done $=\dfrac{\text{force}}{\text{distance}}$, so power $=\dfrac{\text{force}}{\text{velocity}}$

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