15. A child with a weight of 400 N sits in a playground swing. The swing is attached to apair of ropes, each with a length of 2 m. As the child swings, she follows a circular path.At her lowest point, when the ropes are perfectly vertical, the child is at a height of 0.5 mabove the ground. Let us use the ground as our reference point for gravitational potentialenergy. Calculate the gravitational potential energy of the child-Earth system, relative tothe ground, when the ropes make an angle of 30° relative to the vertical.

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Answered: 15. A child with a weight of 400 N sits…

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