Fluid Mechanics

If the terminal speed of a sphere A [density \(\rho_{\mathrm{A}}=7.5 \mathrm{~kg} \mathrm{~m}^{-3}\) ] is \(0.4 \mathrm{~ms}^{-1}\), in a viscous liquid [density \(\rho_{\mathrm{L}}=1.5 \mathrm{~kg} \mathrm{~m}^{-3}\) ], the terminal speed of sphere B [density \(\rho_B=3 \mathrm{~kg} \mathrm{~m}^{-3}\) ] of the same size in the same liquid is