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a uniform plank measures 2m long from it's ends point A to point B. if...

a uniform plank measures 2m long from it's ends point A to point B. if the weight of the plank is 54N and it rests on a knife edge 0.5m from end B and point A is supported by a vertical string so that AB balances horizontally.
determine the tension T, in the string.
determine the force F, acting on the knife edge.?

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