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