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Swing - Potential energy, speed etc.

A 23.0 kg child plays on a swing having support ropes that are 1.90 m long. A friend pulls her back until the ropes are 39.0 (degrees) from the vertical and releases her from rest.

Part a: What is the potential energy for the child just as she is released, compared with the potential energy at the bottom of the swing?

V= ? J

part b: How fast will she be moving at the bottom of the swing?

v= ?m/s

partc: How much work does the tension in the ropes do as the child swings from the initial position to the bottom?

w= ? J

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