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Find the terminal velocity of solid shpe...

Find the terminal velocity of solid shpere or radius `0.1 m` moving in air in vertically downward direction . `(eta=18xx10^(-5) Ns//m^(2)` , density of sphere `=1000 kg//m^(2)` and `g=10^m//s^(2))`

A

2 m/s

B

`1.2 m//s`

C

4 cm/s

D

None of these

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