Spring S has an original length of 12 cm. When a 40g load is hung on it, its length becomes 15 cm. What will be the total length of the spring when a 120g load is hung on it?
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Worked Solution
Step 1: Extension for 40g = 15cm - 12cm = 3cm.
Step [2-9]: 120g is 3 times 40g (120 / 40 = 3).
Step [2-9]: Extension for 120g = 3cm x 3 = 9cm. Total length = 12cm + 9cm = 21cm.
Correct answer: 21 cm
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