A spring has an original length of 12 cm. When a 20g load is hung on it, the length becomes 15 cm. What will the total length be if the load is increased to 60g?
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Worked Solution
Step 1: Extension for 20g = 15cm - 12cm = 3cm.
Step [2-9]: 60g is 3 times the load, so extension = 3cm x 3 = 9cm.
Step [2-9]: Total length = Original length (12cm) + Extension (9cm) = 21cm.
Correct answer: 21 cm
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