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A solid metallic sphere of radius r is a...

A solid metallic sphere of radius r is allowed to fall freely through air. If the frictional resistance due to air is proportional to the cross-sectional area and to the square of the velocity, then the terminal velocity of the sphere is proportional to which of the following ?

A

`r^(2)`

B

r

C

`r^(3//2)`

D

`r^(1//2)`

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