A spring is 10 cm long. A 1-kg load stretches it to 14 cm. What is the extension of the spring when a 0.5-kg load is used?
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Worked Solution
Step 1: Extension for 1-kg = 14cm - 10cm = 4cm.
Step [2-9]: Extension is proportional to load. 0.5-kg is half of 1-kg.
Step [2-9]: Extension for 0.5-kg = 4cm / 2 = 2cm.
Correct answer: 2 cm
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