A spring has an original length of 10 cm. When a 100g weight is hung on it, the length becomes 12 cm. What will the total length be if a 300g weight is hung instead?
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Worked Solution
Step 1: Calculate extension for 100g (12cm - 10cm = 2cm).
Step 2: Extension is proportional to mass. For 300g (3x mass), extension is 3 x 2cm = 6cm.
Step 3: Total length = Original length + New extension (10cm + 6cm = 16cm).
Correct answer: 16 cm
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