A spring stretches by 4 cm when a 20g weight is hung on it. How much will it stretch if a 60g weight is hung on it? (Assume the spring is within its elastic limit).
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Worked Solution
Step 1: Calculate extension per 20g (4 cm).
Step [2-9]: 60g is three times 20g (60 / 20 = 3).
Step [2-9]: Extension = 4 cm x 3 = 12 cm.
Correct answer: 12 cm
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