A 25-kg child on a 2.54-m swing gets pulled back to a 15 angle pulled from the free-hanging position of the swing, and getting let go swings with a period of 3.2 s. A 75-kg adult gets on the same swing and pulled back to a 10 angle from the free-hanging position. Getting let go (and neglecting air resistance), what will the period of the adult on the swing be in s to two significant digits?