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In the ideal treatment, the spring itself is taken as:

AHalf heavy
BFully rigid
CMassless
DVery heavy
Answer & Solution
Correct answer: C. Massless
1. The spring is described as light in the set up. 2. Its own mass is ignored in the working. 3. So it may be treated as massless. _Source: syllabus Physics Part I, Chapter 6, Work, Energy and Power._
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