I've always had a issues with spring problems in physics classes and those friction-less ladder problems too.
Guess you can tag me out on this topic. 
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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