The correct relationship is Weight = Upthrust + Drag, because the object is moving at a constant velocity, which means the net force acting on it is zero. The weight acts downward, while the upthrust and drag forces act upward, so the sum of the upward forces must equal the downward force to maintain equilibrium.
An object descends vertically at constant velocity in sea. The three forces acting on the object are viscous drag upthrust and weight. Which relationship between their magnitude is correct?
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