1. The problem statement, all variables and given/known data A 20 kg child is on a swing that hangs from 3.0-m-long chains. What is her maximum speed if she swings out to a 45 degree angle? 2. Relevant equations KE= 1/2mv^2 Ug= -mgy 3. The attempt at a solution I tried to use conservation of energy to solve this problem. Ki + Ugi= Kf + Ugf Ki=0 (v=0), so Ugi= Kf +Ugf. Then I solved for vf and got 7.67 m/s, which is incorrect. What am I doing wrong? Thanks.