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Q.

A lead shot of 1 mm diameter falls through a long column of glycerin. The variation of its velocity v with distance cover is represented by 

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a

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b

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c

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d

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answer is A.

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Detailed Solution

The lead shot will initially accelerate due to gravity's pull, moving with increasing velocity for a while. With increase in velocity, the viscous force also keep increasing until it balances off the gravitational force. 

The shot will move at a steady speed when the viscous force balances the pull of gravity. 

Hence the correct answer is option A.

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A lead shot of 1 mm diameter falls through a long column of glycerin. The variation of its velocity v with distance cover is represented by