A spring has an original length of 12 cm. When a 20g mass is hung on it, its length becomes 15 cm. If another 40g mass is added, what will be the new total length of the spring?
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Worked Solution
Step 1: Extension for 20g = 15cm - 12cm = 3cm.
Step [2-9]: Total mass = 20g + 40g = 60g.
Step [2-9]: Total extension = (60g / 20g) * 3cm = 3 * 3cm = 9cm. New length = 12cm + 9cm = 21cm.
Correct answer: 21 cm
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