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8.01x – Lect 13 – Potential Energy, Derive Simple Harmonic Motion using Energy

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Lectures by Walter Lewin. They will make you ♥ Physics. 80 tutorials here
Physics

Potential Energy – Energy Considerations to Derive Simple Harmonic Motion – Puzzling Demonstration.
Assignments Lecture 13, 14 and 15: http://freepdfhosting.com/f96866498e.pdf
Solutions Lecture 13, 14 and 15: http://freepdfhosting.com/dbf654957b.pdf