A 25.0 kg child is swinging with a maximum angular displacem…
A 25.0 kg child is swinging with a maximum angular displacement of 18.0° on 3.97 m long ropes. At t = 0, the child is at the bottom of their swing. At a much later time, t = 20 s, the child is again at the bottom of their swing. What is the period (in s) of the swinging child?