Size Reduction and Material Handling

A spherical agricultural grain of diameter $4.0\text{ mm}$ and density $1200\text{ kg/m}^3$ falls in air (air density $\rho_a = 1.20\text{ kg/m}^3$, $g = 9.81\text{ m/s}^2$) in the Newton's turbulent drag regime where drag coefficient $C_d = 0.44$. The terminal velocity $V_t = \sqrt{\frac{4 g d (\rho_p - \rho_a)}{3 C_d \rho_a}}$ in $\text{m/s}$ is ________ (round off to 2 decimal places).