*13-60. At the instant 6 = 60u. the boy's center of mass G
Chapter 13, Problem 13-60(choose chapter or problem)
At the instant \(\theta=60^{\circ}\), the boy's center of mass G has a downward speed \(v_{G}=15 \mathrm{\ ft} / \mathrm{s}\). Determine the rate of increase in his speed and the tension in each of the two supporting cords of the swing at this instant. The boy has a weight of 60 lb. Neglect his size and the mass of the seat and cords.
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