1.

Two drops of the same radius are falling through air with a steady velocity of 5 cm per sec. If the two drops coalesce, the terminal velocity would be                           [MP PMT 1990]

A.            10 cm per sec                       
B.            2.5 cm per sec                      
C.            \[5\times {{(4)}^{1/3}}cm\] per sec                               
D.            \[5\times \sqrt{2}\,cm\] per sec
Answer» D.            \[5\times \sqrt{2}\,cm\] per sec


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