The mass of a liquid flowing per second per unit area of cross section of a tube is proportional to $P^x$ and $v^y$ , where $P$ is the pressure difference and $v$ is the velocity. Then, the relation between $x$ and $y$ is

  • A

    $x = y$

  • B

    $x = -y$

  • C

    $x = -y^2$

  • D

    $y = x^2$

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