A boy pulls a 10-kg box across an ice rink across a distance of 50 m. He exerts a constant force of 10 N on a rope attached to the box at an angle of 60°. How much work has he done on the box?

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A boy pulls a 10-kg box across an ice rink across a distance of 50 m. He exerts a constant force of 10 N on a rope attached to the box at an angle of 60°. How much work has he done on the box?