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An iron sphere of mass $20 \times 10^{-3}\;kg$ falls through a viscous liquid with terminal velocity $0.5\;ms^{-1}.$ The terminal velocity $(in\; ms^{-1})$ of another iron sphere of mass $54 \times 10^{-2}\;kg$ is :

$\begin {array} {1 1} (a)\;4.5 & \quad (b)\;3.5 \\ (c)\;2.5 & \quad (d)\;1.5 \end {array}$

(A) 4.5
Hence A is the correct answer.