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Physics I: Classical Mechanics Practice Problem 1 (and its solution) covers calculating force required and optimal angle for applying force.
Course: 8.01 Physics I: Classical Mechanics, Fall 1999
Instructor: 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
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