Properties of Matter Part 2

A raindrop with radius R=0.2mm falls from a cloud at a height h=2000m above the ground.
Assume that the drop is spherical throughout its fall and the force of buoyance may be neglected, then the terminal speed attained by the raindrop is :
[Density of water fw=1000kgm−3 and Density of air fa=1.2kgm−3,g=10m∕s2
Coefficient of viscosity of air =1.8×10−5Nsm−2 ]