A spring has an original length of 8 cm. When a 20g weight is hung on it, the length is 10 cm. If the total length becomes 15 cm, what is the total weight hung on the spring?
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Worked Solution
Step 1: Extension for 20g = 10cm - 8cm = 2cm.
Step [2-9]: Target extension = 15cm - 8cm = 7cm.
Step [2-9]: Weight per 1cm extension = 20g / 2 = 10g. Total weight = 7cm x 10g = 70g.
Correct answer: 70 g
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