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? (Assume the spring does not exceed its elastic limit).
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Worked Solution
Step 1: Calculate extension for 100g (15cm - 12cm = 3cm).
Step [2-9]: Calculate extension for 300g (3 x 3cm = 9cm).
Step [2-9]: Total length = Original length + Extension (12cm + 9cm = 21cm).
Correct answer: 21 cm
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