Content Times:
0:11 The initial setup
1:00 Part (a) setup
2:11 Part (a) at x = -D
3:07 Part (a) from x = -D to x = 0
4:28 Part (a) from x = 0 to x = 3D
6:39 Part (b)
7:21 Part (b i)
7:50 Part (b ii)
8:33 Part (c)
10:14 Part (d) Question
11:12 Part (d) Answers

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Link to the The 2015 AP Physics 1 Free Response Questions