ungee jumps off a bridge as stant of 17N/m. The natural ained from the jump and neg cord when she reaches maxir ent's maximum speed? os gaining speed when the spring force energy with the reference level at this
ungee jumps off a bridge as stant of 17N/m. The natural ained from the jump and neg cord when she reaches maxir ent's maximum speed? os gaining speed when the spring force energy with the reference level at this
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Transcribed Image Text:A 80kg student bungee jumps off a bridge as shown using an ideal bungee cord
with a spring constant of 17N/m. The natural length of the bungee cord is shown.
Neglect energy gained from the jump and neglect loss until the student rebounds.
How long is the cord when she reaches maximum speed?
89.1
42m
What is the student's maximum speed?
m/s
Hint: The student stops gaining speed when the spring force is equal to her weight. Find this location, then
apply conservation of energy with the reference level at this height.
What is the length of the cord when the student reaches her lowest point?
m
Hint: Set up an equation for conservation of energy in terms of the stretch length (x) and givens only. Then
solve the quadratic.
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