Three identical springs (X, Y, Z) are arranged as shown. When a 4.0-kg mass is hung on X, the mass descends 3.0 cm. When a 6.0-kg mass is hung on Y, the mass descends: 
Definitions:
Concrete Operational
A stage in Piaget's theory of cognitive development, typically occurring between ages 7 and 12, when children gain the ability to think logically about concrete events.
Weaving Practices
The methods and techniques used in the craft of creating textiles or fabric by interlacing threads or yarn.
Knowledge Base
The collection of information, facts, and principles acquired through experience or education.
Middle Childhood
A developmental stage typically referring to children aged from about 6 or 7 to 11 years old, characterized by growing independence and cognitive skills.
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