Physics 9702 · AS & A Level · Equations of motion

Equations of motion — practice question

A car travels along a straight path at constant speed, with the engine supplying a driving force that is equal to the resistive force $F$. After the engine is turned off, the car comes to rest over a distance of $100\,\text{m}$ because of the resistive force. You may assume that $F$ remains unchanged throughout the deceleration. The experiment is then carried out again using the same car with the same initial speed, but this time the resistive force is a constant $0.800F$. What distance does the car cover as it slows down?

  • A$120\,\text{m}$
  • B$125\,\text{m}$
  • C$156\,\text{m}$
  • D$250\,\text{m}$

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