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There is a hole in the bottom of a tank ...

There is a hole in the bottom of a tank having water. If total pressure at bottom is 2 atm (1 atm = 10^5 Nm^(-2)) then the velocity of water flowing from hole is

A

`sqrt 200 ms^(-1)`

B

`sqrt 600 ms^(-1)`

C

`sqrt 60 ms ^(-1)`

D

`sqrt 40 ms^(-1)`

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