Pathfinder Impulse & Momentum MCQ 20

Pathfinder Impulse & Momentum MCQ 20

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Water is flowing through two rigidly connected coplanar U tubes. In the left tube of cross-sectional area A, speed of water flow is u and in the right tube of cross-sectional area A/2 speed water flow in unknown. If the net force on the tube assembly due to water flow is zero, what must be the speed of the water flow in right tube ? Neglect effect of gravity.