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Once you assign a positive direction in a problem, you:
ACannot change it
BMust reverse it
CCan ignore it
DMust double it
Answer & Solution
Correct answer: A. Cannot change it
1. Any direction can be chosen as positive.
2. But once chosen it cannot change.
3. Consistency is what matters.
_Source: OpenStax College Physics for AP Courses 2e, Chapter 2, Kinematics (CC BY 4.0)._
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