Type $1$ Sedimentation Theory

Problem $1$: A WW sample contains sand particles with an average diameter of $0\mathrm{.}13$ mm $,$ a

specific gravity of $2\mathrm{.}65$ and settling in water at $22C.$ At this temperature, the bulk viscosity

value is $9\mathrm{.}55{10}^{-4}k\frac{g}{m}-sec.$ Assume water density as $1000k\frac{g}{m^3}$ and $g=9\mathrm{.}81\frac{m}{se{c}^2}.$

What is the terminal settling velocity of the particles?