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Water flows steadily through a horizontal pipe of a variable cross-section. If the pressure of water is p at a point where the velocity of flow is v, what is the pressure at another point where the velocity of flow is 2v, `rho` being the density of water?

A

`rho-3/2 rho v^2`

B

`rho+3/2 rho v^2`

C

`rho-2 rho v^2`

D

`rho+2 rho v^2`

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