A spring has an original length of 12 cm. When a 100g load is hung on it, its length becomes 15 cm. What will its total length be if a 300g load is hung on it?
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Worked Solution
Step 1: Extension for 100g = 15 cm - 12 cm = 3 cm.
Step [2-9]: Extension for 300g = 3 cm × 3 = 9 cm.
Step [2-9]: Total length = 12 cm (Original) + 9 cm (Extension) = 21 cm.
Correct answer: 21 cm
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