Siti hung different weights on a spring and measured its total length. The original length of the spring was 12 cm. When a 100g weight was hung, the length became 15 cm. What would the total length be if a 300g weight was hung?
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Worked Solution
Step 1: Calculate extension for 100g (15cm - 12cm = 3cm).
Step [2-9]: 300g is 3 times 100g, so extension is 3cm x 3 = 9cm.
Step [2-9]: Total length = Original length + Extension = 12cm + 9cm = 21cm.
Correct answer: 21 cm
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