College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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In class we learned about Kate, a bungee jumper with mass ? = 50.0 kg who jumps off a bridge of
height ℎ = 25.0 m above a river. After she jumps, the bungee cord – which behaves as an ideal spring
with spring constant ? = 28.5 N/m – stretches to a new equilibrium with length ?? = 20.0 m.

a) What is the unstretched length of the bungee cord without Kate attached?

After hanging out at this new equilibrium for a bit, Kate starts to get worried. She yells up to her friend Ken, who is frantically trying to figure out how to hoist her back up. After a couple of hours of this, Kate
starts to get hungry. She begs Ken to throw her down a backpack full of provisions with mass ? = 15.0 kg. Ken complies, dropping the bag from the bridge with no initial velocity. Throughout this problem, you
may neglect all sources of friction or other non-conservative forces.


b) Kate catches the bag when it gets to her. What are the momenta of Kate and the bag just before she catches it? What about just after?

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Original Length of the Rope
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