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Uniform speed of 2 cm diameter ball is `20cm//s` in a viscous liquid. Then, the speed of 1 cm diameter ball in the same liquid is

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Uniform speed of 2 cm diameter ball is `20cm//s` in a viscous liquid. Then, the speed of 1 cm diameter ball in the same liquid is
A. `80cms^-1`
B. `40cms^-1`
C. `20cms^-1`
D. `5cms^-1`
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Correct Answer - D
`vpropr^2`
Since `r` becomes one-half therefore `v_0` becomes one-fourth
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