A hole is made at the bottom of the tank filled with water (density $1000\, kg/m^3$). If the total pressure at the bottom of the tank is $3$ atmosphere ($1$ atmosphere $= 10^5\, N/m^2$), then the velocity of efflux is
  • A$\sqrt {200} \,m/s$
  • B$\sqrt {400} \,m/s$
  • C$\sqrt {500} \,m/s$
  • D$\sqrt {800} \,m/s$
AIIMS 2000, Medium
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