My Notes Ask A 270-N child is in a swing that is attached to a pair of ropes 2.20 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 (b) when the ropes make a 26.0° angle with the vertical (c) when the child is at the bottom of the circular are Need Help? Het Submit Answer Practice Another Version