A 96 kg man walks along a 50 kg horizontal plank which is 4, Ask an Expert

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A 96 kg man walks along a 50 kg horizontal plank which is 4 m long. The plank is attached to a hinge mounted to one wall, and the far end is supported by a vertical wire which is attached to an anchor in the ceiling. The wire can just barely support the man's full weight without snapping.

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