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Homework Help: Arrangements of Springs and Extension

  1. Mar 29, 2012 #1
    1. The problem statement, all variables and given/known data
    http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_s05_qp_1.pdf (not sure how to post the picture directly..)

    Number 20

    2. Relevant equations
    1/(n springs) weight is supported if parallel
    n if in series

    3. The attempt at a solution
    The answer is A but Im not sure how to get to it.How do I use the amount of weight supported by springs to get the extension? Especially when there are 2 "levels" of springs.

    For X each spring supports mg/2
    For Y mg/2
    For Z the upper pair supports mg/2
    Lower pair mg
  2. jcsd
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