Physics I: Classical Mechanics Practice Problem 1 (and its solution) covers the speed and kinetic energy at bottom, for two different masses. Course: 8.01 Physics I: Classical Mechanics, Fall 1999Instructor: Prof. Walter Lewin Prof. Walter Lewin, 8.01 Physics I: Classical Mechanics, Fall 1999. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed November 21, 2008). License: Creative Commons BY-NC-SA http://ocw.mit.edu/OcwWeb/web/terms/terms/index.htm#cc http://creativecommons.org/licenses/by-nc-sa/3.0/us/legalcode