A father pulls his son whose mass is 229 kg and who is, Ask an Expert

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A father pulls his son, whose mass is 22.9 kg and who is sitting on a swing with ropes of length 3.21 m, backward until the ropes make an angle of 36.8° with respect to the vertical. He then releases his son from rest. What is the speed of the son at the bottom of the swinging motion?

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