A spring extends by 4 cm when a 20g load is hung on it. If the load is increased to 60g, what will be the total extension of the spring?
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Worked Solution
Step 1: Calculate the extension per unit mass: 4 cm / 20g = 0.2 cm per gram.
Step [2-9]: Multiply by the new load: 60g x 0.2 cm/g = 12 cm.
Step [2-9]: Alternatively, 60g is 3 times 20g, so extension is 4 cm x 3 = 12 cm.
Correct answer: 12 cm
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