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A 400-N child is in a swing that is attached to ropes 2.00 m long. Find the gravitational potential energy of the childEarth system relative

A 400-N child is in a swing that is attached to ropes 2.00 m long. Find the gravitational potential energy of the child–Earth system relative to the child’s lowest position when (a) The ropes are horizontal (b) The ropes make a 30.0° angle with the vertical, and (c) the child is at the bottom of the circular arc.

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