The diagram depicts a section of hose used by a firefighter. Water travelling at $6\,\text{m s}^{-1}$ enters the nozzle, while water travelling at $1\,\text{m s}^{-1}$ exits. Each second, $15\,\text{kg}$ of water passes through the hose. Which force is exerted on the hose by the water?
- A$15\,\text{N}$
- B$75\,\text{N}$
- C$90\,\text{N}$
- D$105\,\text{N}$