Spring A has an original length of 12 cm. When a 50g load is added, its length becomes 15 cm. If another 100g load is added to the existing 50g load, what is the new total length of the spring?
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Worked Solution
Step 1: Extension for 50g = 15cm - 12cm = 3cm.
Step [2-9]: Total load = 50g + 100g = 150g.
Step [2-9]: 150g is 3 times 50g, so total extension = 3cm x 3 = 9cm. New length = 12cm + 9cm = 21cm.
Correct answer: 21 cm
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