The velocity of water in a river is $18\, km/h$ near the surface. If the river is $5\, m$ deep,find the shearing stress between the horizontal layers of water. The coefficient of viscosity of water is $\eta = 10^{-2}\, \text{poise}$.
- A$10^{-1}\, N/m^2$
- B$10^{-2}\, N/m^2$
- C$10^{-3}\, N/m^2$
- D$10^{-4}\, N/m^2$
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