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A child of mass 30 kg stands at the edge of a merry-go-round of mass 130 kg and radius 2.3 m, and both are initially at rest. The child then walks along the edge of the merry-go-round until she reaches a point opposite her starting point as measured on the ground (point B in the figure below). How far does the child walk as measured relative to the merry-go-round?

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