A liquid flows through a horizontal tube. The velocities of the liquid in the two sections, which have areas of cross-section ${A_1}$ and ${A_2}$, are ${v_1}$ and ${v_2}$ respectively. The difference in the levels of the liquid in the two vertical tubes is $ h$

  • A

    The volume of the liquid flowing through the tube in unit time is ${A_1}{v_1}$

  • B

    The energy per unit mass of the liquid is the same in both sections of the tube

  • C

    $v_2^2 - v_1^2 = 2gh$

  • D

    All of the above

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