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Q.

A solid sphere falls with a terminal velocity of 10 cm/sec in air. If it is allowed to fall in vacuum, the terminal velocity will

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a

be less than 10 cm/sec 

b

be equal to 10 cm/sec  

c

never be attained

d

be more than 10 cm/sec  

answer is D.

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Detailed Solution

If there is no medium there is no viscous force so due to gravity its velocity will be keep on increasing it will never attained a terminal velocity.

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A solid sphere falls with a terminal velocity of 10 cm/sec in air. If it is allowed to fall in vacuum, the terminal velocity will