A small metallic sphere of diameter 2 mm and density 10.5 g / cm^3 is dropped in glycerine having viscosity 10 Poise and density 1.5 g / cm^3…

A small metallic sphere of diameter $\displaystyle 2$ mm and density $\displaystyle 10.5 \mathrm{~g} / \mathrm{cm}^3$ is dropped in glycerine having viscosity $\displaystyle 10$ Poise and density $\displaystyle 1.5 \mathrm{~g} / \mathrm{cm}^3$ respectively. The terminal velocity attained by the sphere is $\displaystyle \_\_\_\_$ $\displaystyle \mathrm{cm} / \mathrm{s}$. ( $\displaystyle \pi=\frac{22}{7}$ and $\displaystyle g=10 \mathrm{~m} / \mathrm{s}^2$ )