Bungee Jumping Originating on Pentecost Island in thePacific, the practice of a person jumping from a high placeharnessed to a flexible attachment was introduced toWestern culture in 1979 by the Oxford University DangerousSport Club. One important parameter to know beforeattempting a bungee jump is the amount the cord will stretchat the bottom of the fall. The stiffness of the cord is related tothe amount of stretch by the equation 2W(S + L)K =where W = weight of the jumper (pounds)K = cord's stiffness (pounds per foot)L = free length of the cord (feet)S = stretch (feet)(a) A 150-pound person plans to jump off a ledge attachedto a cord of length 42 feet. If the stiffness of the cord isno less than 16 pounds per foot, how much will the cordstretch?(b) If safety requirements will not permit the jumper toget any closer than 3 feet to the ground, what is theminimum height required for the ledge in part (a)?Source: American Institute of Physics, Physics News Update,No. 150, November 5, 1993.

W=Weight of person=150 poundS=StretchL=Free length of cord=42 feetK=Cord stiffness=16 pounds/foot

Answered: 2W(S + L) K = where W = weight of the…

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Chapter5: Newton's Law Of Motion

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Bungee Jumping Originating on Pentecost Island in the
Pacific, the practice of a person jumping from a high place
harnessed to a flexible attachment was introduced to
Western culture in 1979 by the Oxford University Dangerous
Sport Club. One important parameter to know before
attempting a bungee jump is the amount the cord will stretch
at the bottom of the fall. The stiffness of the cord is related to
the amount of stretch by the equation

2W(S + L)
K =
where W = weight of the jumper (pounds)
K = cord's stiffness (pounds per foot)
L = free length of the cord (feet)
S = stretch (feet)
(a) A 150-pound person plans to jump off a ledge attached
to a cord of length 42 feet. If the stiffness of the cord is
no less than 16 pounds per foot, how much will the cord
stretch?
(b) If safety requirements will not permit the jumper to
get any closer than 3 feet to the ground, what is the
minimum height required for the ledge in part (a)?
Source: American Institute of Physics, Physics News Update,
No. 150, November 5, 1993.

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