Problem: A husband and wife take turns pulling their child in a wagon along a horizontal sidewalk. Each exerts a constant force and pulls the wagon through the same displacement. They do the same amount of work, but the husband's pulling force is directed 58° above the horizontal, and the wife's pulling force is directed 38° above the horizontal. The husband pulls with a force whose magnitude is 68 N.
Part A: What is the magnitude of the pulling force exerted by his wife?
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I need help to find the magnitude of the pulling force exerted by his wife.