A raindrop with radius $R = 0.2\,\,{\rm{mm}}$ falls from a cloud at a height $h\, = \,2000\,\,{\rm{m}}$ above the ground. Assume that, drop is spherical throughout its fall and the force of buoyance may be neglected, then the terminal speed attained by the raindrop is <br> (Take, density of water, ${\rho _w} = 1000\,\,kg\,{m^{ - 3}}$ and density of air, ${\rho _a} = 1.2\,\,kg\,{m^{ - 3}},$ $g\, = \,10\,\,m/{s^2}$ , coefficient of viscosity of air, ${\rm{\eta }}\,{\rm{ = }}\,{\rm{1}}{\rm{.8 \times 1}}{{\rm{0}}^{ - {\rm{5}}}}\,\,{\rm{N - s}}\,\,{{\rm{m}}^{