$A$ liquid flows in a tube from left to right as shown in the figure. $A_1$ and $A_2$ are the cross-sections of the portions of the tube as shown. Then the ratio of speeds $v_1/v_2$ will be

  • A
    $A_1/A_2$
  • B
    $A_2/A_1$
  • C
    $\sqrt{A_2}/\sqrt{A_1}$
  • D
    $\sqrt{A_1}/\sqrt{A_2}$

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