A drop of radius 2xx10^(-5) and density ...

A drop of radius `2xx10^(-5)` and density `1.2xx10^(3)kg//m^(3)` falls through air. The viscosity of air is `1.8xx10^(-5) N s//m^(2).` Neglecting buoyancy due to air, the terminal speed of the drop is

`2.8cm//s`

`3.8cm//s`

`4.8cm//s`

`5.8 cm//s`

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