While standing on a long board

While standing on a long board resting on a scaffold a 70-kg painter paints the side of a house as shown in fig 8.40. If the mass of the board is 15 kg how close to the end can the painter stand without tipping the board over? The board is 5.5 m long 1.5 m on either side with poles (supports) coming up at those lengths and 2.5 m directly in the middle is where the x braces are placed.

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