(Answered) A child with a weight of 130 n swings on a playground swing

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A child with a weight of 130 N swings on a playground swing attached to 2.10-m-long chains. What is the child's gravitational potential energy relative to his lowest position at the following times?

(a) When the chains are horizontal

(b) When the chains make an angle of 28.0° with respect to the vertical

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