A rectangular gate 1.4 m in base and 1.8 m high is placed on the face of the water reservoir, as shown in the figure. Its upper portion is hinged and the base is attached to a cylindrical buoy whose weight is 20 kg. The external diameter of the buoy is 2 m and the weight of the gate is 50 kg. The mechanism is such that the buoy will open the gate if water surface will rise higher than 4 m. What is the height of the buoy below the water surfa

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