A 330-N child is in a swing that is attached to a pair of ropes 2.10 m long. Find the gravitational potential energy of the child–Earth system relative to the child's lowest position at the following times.
(a) when the ropes are horizontal
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(b) when the ropes make a 29.0° angle with the vertical
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(c) when the child is at the bottom of the circular arc
J
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