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(4) A vertical rectangular gate of 4m width and 2m depth is hinged at a point 0.25 m below the centre of gravity of

(4) A vertical rectangular gate of 4m width and 2m depth is hinged at a point 0.25 m below the centre of gravity of the gate. If the top edge of gate is 5 m below free surface of water and total depth of water is 7 m, what horizontal force must be applied at the bottom to keep the gate closed?

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