Water is sent through a hose-pipe at a rate of $90\,\text{kg per minute}$. The water leaves the hose-pipe horizontally at a speed of $20\,\text{m s}^{-1}$. What minimum force must a person holding the hose-pipe apply to stop it moving backwards?
- A$30\,\text{N}$
- B$270\,\text{N}$
- C$1800\,\text{N}$
- D$110\,000\,\text{N}$