A spring extends by 4 cm when a 20g load is added. If the original length is 12 cm, what is the length with a 40g load?
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Worked Solution
Step 1: Extension for 20g = 4 cm.
Step [2-9]: Load doubled (40g), so extension doubles: 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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