The terminal velocity of a metallic ball of radius 6 mm in a viscous fluid is 
. The terminal velocity of another ball of same material and having radius 3 mm in the same fluid will be 
.
Text Solution
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(5) For a sphere in a viscous fluid, terminal velocity is proportional to 
.
For two balls of the same material in the same fluid: 
.
Given 
, and 
.
Therefore, 
.
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