A spring has an original length of 12 cm. When a 20g weight is hung on it, the length becomes 15 cm. What is the total length of the spring when a 60g weight is hung on it?
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Worked Solution
Step 1: Calculate extension for 20g: 15cm - 12cm = 3cm.
Step [2-9]: Calculate extension for 60g: 3cm x (60g / 20g) = 3cm x 3 = 9cm.
Step [2-9]: Total length = 12cm + 9cm = 21cm.
Correct answer: 21 cm
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