ch08-p021 - 21. (a) As the string reaches its lowest point,...

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21. (a) As the string reaches its lowest point, its original potential energy U = mgL (measured relative to the lowest point) is converted into kinetic energy. Thus, mgL mv v gL = ¡ = 1 2 2 2 . With L = 1.20 m we obtain v = 485 .m s . (b) In this case, the total mechanical energy is shared between kinetic
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