A hole is made at the bottom of a tank filled with water (density= 103 kg/m3). If the total pressure at the bottom of the tank is 3 atm (1 atm = 105 N/m2), then the velocityof efflux is

Total pressure at the bottom = 3 atmPressure due to water in the tank = 3 atm - 1 atm = 2 atm = 20 m of water columnHeight of water in the tank is h = 20 mSo, velocity of efflux=2gh=2×10×20=400=20m/s