A spring is stretched by 4 cm when a 20g load is attached. If a 60g load is attached instead, what is the total extension of the spring?
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Worked Solution
Step 1: 20g causes 4cm extension.
Step [2-9]: 60g is 3 times heavier than 20g.
Step [2-9]: Extension = 4cm x 3 = 12cm.
Correct answer: 12 cm
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