question_answer

27 identical drops of water are falling down vertically in air each with a terminal velocity\[0.15\text{ }m{{s}^{-1}}\]. If they combine to form a single bigger drop, what will be its terminal velocity?

A)  \[0.3\text{ }m{{s}^{-1}}\]           

B)  \[1.35\,m{{s}^{-1}}\]    

C)         \[0.45\,m{{s}^{-1}}\]      

D)         zero

E)  \[0.95\,m{{s}^{-1}}\]