Falling charged water drop

A water drop of \(18 \times 10^{-3} g\) falls from a charged sphere . The drop's charge is \(10^{-9} C\) . There remains \( 2.5 \times 10^{-6} C\) in the sphere . The radius of the sphere is \(20 cm\) . When the drop falls \(30 cm\) , what will be its velocity in \( ms^{-1}\) ?

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