There is a hole in the bottom of tank having water. If total pressure at bottom is 3 atm (1 atm = 105N/m2) then the velocity of water flowing from hole is

Pressure at the bottom of tank P=3×105 Nm2Pressure due to liquid column                               Pl  =  ρgh=3×105−1×105=2×105 N/m2and velocity of water  v=2gh∴ v=2Plρ=2×2×105103=400 m​/​s