Physics 9702 · AS & A Level · Linear momentum and its conservation

Linear momentum and its conservation — practice question

A wall is struck by a strong wind travelling at $33\,\text{m s}^{-1}$. The air density is $1.2\,\text{kg m}^{-3}$. The wall presents an area of $12\,\text{m}^2$ perpendicular to the wind velocity. When the air reaches the wall, its speed is reduced to zero. What is the approximate force exerted by the air on the wall?

  • A$330\,\text{N}$
  • B$400\,\text{N}$
  • C$480\,\text{N}$
  • D$16000\,\text{N}$

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