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NEET 2003 (AIPMT) · Spring & Elastic Energy

Spring & Elastic Energy question from NEET 2003 (AIPMT)

Q31NEET 2003 · AIPMTEasy

Spring & Elastic Energy

When a long spring is stretched by 2 cm, its potential energy is U. If the spring is stretched by 10 cm, the potential energy stored in it will be

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Answer: (d)

$U = \frac{1}{2}kx^2 \Rightarrow U \propto x^2$ .
$\frac{U'}{U} = \left(\frac{10}{2}\right)^2 = 25$
So the answer is (d) $25U$ .

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