The graph shows the extension of a spring when different weights are added. What is the extension when a 30g weight is hung on the spring?
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Worked Solution
Step 1: Observe the pattern in the graph. 10g causes 3cm extension.
Step [2-9]: 20g causes 6cm extension. This is a linear relationship (3cm per 10g).
Step [2-9]: For 30g, the extension is 3cm x 3 = 9cm.
Correct answer: 9 cm
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