A rectangular tank of length 1 m and breadth 0.5 m is partially filled with water. When the tank is moving horizontally with a constant acceleration of $\frac{10}{\sqrt{3}}m/s^2$ parallel to its length, the angle between free surface of water and horizontal will be $\left(Takeg=10m/s^2\right)$

• A

  ${30}^0$

• B

  ${45}^0$

• C

  ${37}^0$

• D

  ${60}^0$