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The amplitude of SHM can be taken as a quantity that is:

ANegative
BImaginary
CUndefined
DPositive
Answer & Solution
Correct answer: D. Positive
1. Amplitude is a magnitude, so its sign is a matter of convention. 2. Nothing is lost by fixing that convention. 3. It can be taken to be positive. _Source: syllabus Physics Part II, Chapter 14, Oscillations._
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