This Short Answer question also works as a part of the AP Physics C: Mechanics curriculum.

Content Times:
0:11 The initial setup
0:29 Part (a)
1:52 Advice about Free Body Diagrams (or Force Diagrams)
2:47 Part (b)
4:37 Part (c)
6:34 A shorter answer to Part (c)

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Link to the The 2015 AP Physics 1 Free Response Questions