A spring is 12 cm long. When a 50g weight is hung on it, its length becomes 15 cm. If the same spring is pulled until its length is 21 cm, what is the weight of the object hung on it? (Assume the elastic limit is not reached).
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Worked Solution
Step 1: Extension for 50g = 15 - 12 = 3 cm.
Step [2-9]: Target extension = 21 - 12 = 9 cm.
Step [2-9]: Ratio: 9 cm / 3 cm = 3. Weight = 50g x 3 = 150g.
Correct answer: 150 g
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