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A child with a weight of 170 N swings on a playground swing attached to 2.00...

A child with a weight of 170 N swings on a playground swing attached to 2.00 m long chains. What is the gravitational potential energy (in J) of the child-earth system relative to the child's lowest position at the following times?

(a) when the chains are horizontal

________ J

(b) when the chains make an angle of 32.0° with respect to the vertical

________ J

(c) when the child is at his lowest position

________ J

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