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A wood plank has a length of 4.2 m and a mass of 14.3 kg. The plank is balanced between two saw horses. One saw horse is positioned directly under one end of the plank, and the other is located a distance d1 = 3.2 m away. A child with a mass of 29 kg walks along the plank, as if it were a balance beam. What is the furthest distance d2 (in meters) from the end of the plank that the child can walk before the plank tips and falls? NOTE: When the plank starts to tip, one of the forces becomes zero.
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