A spring has an original length of 12 cm. When a 40g weight is hung on it, its length becomes 15 cm. What will be the length of the spring if a 120g weight is hung on it?
Show Worked Solution
Worked Solution
Step 1: Calculate extension for 40g (15cm - 12cm = 3cm).
Step [2-9]: 120g is three times 40g (120 / 40 = 3).
Step [2-9]: Total extension = 3cm x 3 = 9cm.
Step [2-9]: New length = 12cm + 9cm = 21cm.
Correct answer: 21 cm
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