At a point on a streamline, the velocity is 3 m/s and the radius of curvature is 9 m. If the rate of increase of velocity along the streamline at this point is 1/3 m/s/m, then the total acceleration at this point would be -

- 1
  
  $1 m / s^{2}$
- 2
  
  $3 m / s^{2}$
- 3
  
  $1 / 3 m / s^{2}$
- 4
  
  $\sqrt{2} m / s^{2}$

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