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Energy and Momentum - Child on a Swing

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See the attachment for a diagram of the scenario below.
A child with a mass of 22 kg sits on a swing and is held in the position shown by a second child. (35 deg from vertical). Neglecting the mass of the swing, determine the tension in rope AB...

a) while the second child holds the swing with his arms outstretched horizontally,

b) immediately after the swing is released.

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The solution offers a quick, clear solution, aided by a free body diagram in the attached document.

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