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18. 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

(a)  10 cm per sec                            (b)  2.5 cm per sec

(c) 5×4¹/3   per sec                         (d) 5×√2  per sec

Answer-c

(2)

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