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Eight equal drops of water are falling t...

Eight equal drops of water are falling through air with a steady velocity of 10 `cms^(-1)`. If the drops combine to form a single drop big in size, then the terminal velocity of this big drop is

A

`80cms^(-1)`

B

`30cms^(-1)`

C

`10cms^(-1)`

D

`40cms^(-1)`

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