A spring has an original length of 12 cm. When a 50g load is hung on it, its length becomes 15 cm. What will be the length of the spring if a 150g load is hung on it? (Assume the spring is within its elastic limit).
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Worked Solution
Step 1: Extension for 50g = 15cm - 12cm = 3cm.
Step [2-9]: Extension for 150g = 3cm x (150g / 50g) = 9cm.
Step [2-9]: Total length = 12cm + 9cm = 21cm.
Correct answer: 21 cm
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