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A child with a weight of 230 N swings on a playground swing attached to 2.20-m-long...

A child with a weight of 230 N swings on a playground swing attached to 2.20-m-long chains. What is the gravitational potential energy of the child-Earth system relative to the child's lowest position at the following times?

(a) when the chains are horizontal (in J)

b) when the chains make an angle of 33.0° with respect to the vertical (in J)

(c) when the child is at his lowest position (in J)

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