Spring potential energy example (mistake in math)

Title:
Spring potential energy example (mistake in math)
Description:

A spring, a frozen loop-d-loop and more! (See if you can find the mistake I made and get the right answer!)

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Video Language:
English
Duration:
09:38
http://www.youtube.com/watch?v=P3QV9ktuYlQ
Format: Youtube
Primary
Original
Added   by None
Format: Youtube
Primary
Original
This video is part of Amara Public.