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At 20.C, to attain the terminal velocity...

At `20.`C, to attain the terminal velocity how fast willan aluminium sphre of radii 1 mm fall though water. Assume flow to be laminar flow and specific gravity (AI) `=2.7eta_("water")=8xx10^(-4) Pa`

A

5 m/s

B

`4.6 m//d`

C

4 m/s

D

2 m/s

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