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OCW Scholar - Physics I: Classical Mechanics 14 Online
OpenStudy (anonymous):

Does anyone know the answer to the question that the prof asked at the end of lecture 13?

OpenStudy (anonymous):

The clue is that the ball is rolling... :)

OpenStudy (anonymous):

the lecture in reference is http://videolectures.net/mit801f99_lewin_lec13/

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