A spring extends by 4 cm when a 20g weight is hung on it. What is the total length of the spring when a 50g weight is hung on it, given that its original length is 12 cm?
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Worked Solution
Step 1: Extension per gram = 4cm / 20g = 0.2 cm/g.
Step [2-9]: Extension for 50g = 0.2 cm/g x 50g = 10 cm.
Step [2-9]: Total length = Original length + Extension = 12 cm + 10 cm = 22 cm.
Correct answer: 22 cm
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