A 40kg child on a 2.30 m long swing is released from rest, Ask an Expert

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Q. A 40kg child on a 2.30 m long swing is released from rest when the swing supports make an angle of 26 degrees with the vertical. The acceleration of gravity is 9.8 m/s2. If the speed of the child at the lowest position is 1.91047 m/s, what is the mechanical energy degenerate by the various resistive forces?

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