Description
The theoretical description of center of mass always mentions the fact that when no external force acts on a system of two bodies the c.m moves with uniform velocity. Watch this rare experiment where this fact has been demonstrated spectacularly.
Prof. Walter Lewin,8.01Classical Mechanics, Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed June 10, 2011). License: Creative Commons BY-NC-SA: http://ocw.mit.edu/terms/#cc
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