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A vessel contain a liquid has a constant acceleration $19.6 \,m / s ^2$ in horizontal direction. The free surface of water get sloped with horizontal at angle .......... 
  • A$\tan ^{-1}\left[\frac{1}{2}\right]$
  • B$\sin ^{-1}\left[\frac{1}{\sqrt{3}}\right]$
  • C$\tan ^{-1}[\sqrt{2}]$
  • D$\sin ^{-1}\left[\frac{2}{\sqrt{5}}\right]$
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