A spring has an original length of 12 cm. When a 40g weight is hung on it, the length becomes 15 cm. What will the total length be if the weight is increased to 120g?
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Worked Solution
Step 1: Extension for 40g = 15 - 12 = 3 cm.
Step [2-9]: 120g is 3 times 40g, so extension = 3 cm x 3 = 9 cm.
Step [2-9]: Total length = 12 cm (original) + 9 cm (extension) = 21 cm.
Correct answer: 21 cm
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