Water flows steadily through a horizontal pipe of variable cross-section. If the pressure of water is $P$ at a point where flow speed is $v$,the pressure at another point where the flow speed is $2v$,is (Take density of water as $\rho$)

  • A
    $P - \frac{3\rho v^2}{2}$
  • B
    $P - \frac{\rho v^2}{2}$
  • C
    $P - \frac{3\rho v^2}{4}$
  • D
    $P - \rho v^2$

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