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Eight spherical rain drops of the same mass and radius are falling down with a terminal speed of $6\;cm-s^{-1}$. If they coalesce to form one big drop, what will be the terminal speed of bigger drop? (Neglect the buoyancy of the air )

$\begin {array} {1 1} (1)\;1.5\;cm-s^{-1} & \quad (2)\;6\;cm-s^{-1} \\ (3)\;24\;cm-s^{-1} & \quad (4)\;32\;cm-s^{-1} \end {array}$
Can you answer this question?

$(3)\;24\;cm-s^{-1}$
answered Nov 7, 2013 by