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Two streams of water flow through the U-shaped tubes shown. The tube on the left has cross-sectional area A, and the speed of the water flowing through it is v. The tube on the right has cross-sectional area A' = A/2. If the net force on the tube assembly is zero, what must be the speed v' of the water flowing through the tube on the right? Neglect gravity, and assume that the speed of the water in each tube is the same upon entry and exit.

(A).5v
(B) v
(C) 1.414v
(D) 2v
(E) 4v

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