A manometer connected to a closed tap re...

A manometer connected to a closed tap reads `4.5 xx 10^(5)` pascal. When the tap is opened the reading of the manometer falls is `4 xx 10^(5)` pascal. Then the velocity of flow of water is

`7 m s^(-1)`

`8 m s^(-1)`

`9 m s^(-1)`

`10 ms^(-1)`

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