A spring extends by 4 cm when a 20g load is hung on it. What is the total length of the spring if its original length is 12 cm and a 40g load is hung on it?
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Worked Solution
Step 1: Extension for 20g = 4 cm.
Step [2-9]: Extension for 40g = 4 cm x 2 = 8 cm.
Step [2-9]: Total length = Original length + Extension = 12 cm + 8 cm = 20 cm.
Correct answer: 20 cm
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