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A small ball (mass m) falling under gravity in a viscous medium experiences a drag force proportional to the instantaneous speed u such that F_drag = ku. Then, the terminal speed of ball with in viscous medium is

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$\frac{k}{m g}$

$\frac{m g}{k}$

$\sqrt{\frac{m g}{k}}$

None of these

answer is D.

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Detailed Solution

Weight- Upthrust = Drag force.
But no information is given regarding the upthrust.

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