A vertical tank, open at the top, is filled with a liquid and rests on a smooth horizontal surface.$A$ small hole is opened at the centre of one side of the tank. The area of cross-section of the tank is $N$ times the area of the hole, where $N$ is a large number. Neglect mass of the tank itself. The initial acceleration of the tank is 
  • A$\frac{g}{{2N}}$
  • B$\frac{g}{{\sqrt 2 N}}$
  • C$\frac{g}{N}$
  • D$\frac{g}{{2\sqrt N }}$
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