A tank is filled with water of density 1...

A tank is filled with water of density `10^(3)kg//m^(3)` and oil of density `9xx10^(3)kg//m^(3)`.The height of water layer is `1 m` and that of the oil layer is `4 m`. The velocity of efflux front an opening in the bottom of the tank is

`sqrt(900xx980)"cm "s^(-1)`

`sqrt(1000xx980)"cm "s^(-1)`

`sqrt(920xx980)" cm "s^(-1)`

`sqrt(950xx980)" cm "s^(-1)`

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