The utility of bungee cords is so persistently attractive that they continue to gain in popularity. Unfortunately, one of the characteristics of bungee cords is the sudden release of stored energy which results from opening of hooks, failure of the bungee cord and hook connection, inadvertent release of the bungee cord during application, and failure of the structure receiving the hook. Each of these failure modes allows the free end of the bungee cord to attain high speeds which produce injuries through impact. The design of personal protection equipment and the evaluation of the danger level related to a released bungee cord require information on hook speed. This paper presents a first order analysis of the maximum attainable speed.

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