There is a hole in the bottom of tank having water. If total pressure at bottom is $ 3 atm$  ($1 atm = 10^5N/m^2$) then the velocity of water flowing from hole is
  • A$\sqrt {400} \,m/s$
  • B$\sqrt {600\,} \,m/s$
  • C$\sqrt {60} \,m/s$
  • D
    None of these
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