- #1

thoradicus

- 45

- 0

## Homework Statement

http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s05_qp_1.pdf (not sure how to post the picture directly..)

Number 20

## Homework Equations

F=kx

1/(n springs) weight is supported if parallel

n if in series

## The Attempt at a Solution

The answer is A but I am 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