Physics 9702 · AS & A Level · Energy conservation

Energy conservation — practice question

A model car moves in a straight horizontal path with a constant velocity of $12\,\text{m s}^{-1}$. The power supplied to the engine is $800\,\text{W}$. The engine has an efficiency of $60\%$. What is the total horizontal resistive force acting on the car?

  • A$27\,\text{N}$
  • B$40\,\text{N}$
  • C$67\,\text{N}$
  • D$110\,\text{N}$

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