Physics 9702 · AS & A Level · Momentum and Newton's laws of motion

Momentum and Newton's laws of motion — practice question

A ship with mass $8.4 \times 10^7\,\text{kg}$ is moving towards a harbour at speed $16.4\,\text{m s}^{-1}$. Using reverse thrust, it is able to keep a constant total stopping force of $920\,000\,\text{N}$. How long does it take to come to rest?

  • A$15\,\text{s}$
  • B$150\,\text{s}$
  • C$25\,\text{minutes}$
  • D$250\,\text{minutes}$

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