At the instant θ = 60°, the boy's center of mass G is momentarily at rest. Determine h...

At the instant θ = 60°, the boy's center of mass G is momentarily at rest. Determine his speed and the tensionin each of the two supporting cords of the swing whenθ = 90°. The boy has a weight of 60 lb. Neglect his size andthe mass of the seat and cords.