46 long and is started swinging by releasing it when the rope makes an 11.0 angle with the vertical.

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A 2.69 rock is attached at the end of a thin, very light rope 1.46 long and is started swinging by releasing it when the rope makes an 11.0 angle with the vertical. You record the observation that it rises only to an angle of 4.50 with the vertical after swings. How much energy has this system lost during that time?

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