The speed of a ball of radius 2 cm ...

The speed of a ball of radius 2 cm in a viscous liquid medium is 20 cm ` . S^(-1)` . The speed of a ball of radius 1 cm in the same liquid will be

`5 cm * s^(-1) `

` 10 cm * s^(-1) `

`40 cm * s^(-1)`

`80 cm * s^(-1) `

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