A 23.0 {\rm kg} child plays on a swinghaving support ropes that are 2.20 {\rm m} long. A friend pulls herback until the ropes are 43.0^\circ from the vertical andreleases her from rest.
What is the potential energy for the child just as she is released,compared with the potential energy at the bottom of the swing?
How fast will she be moving at the bottom of the swing?
How much work does the tension in the ropes do as the child swingsfrom the initial position to the bottom?