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Q.

Natural length of a spring is 60 cm, and its spring constant is 4000 N/m. A mass of 20 kg is hung from it. The extension produced (in cm) in the spring is, (Take g=9.8 m/s2)

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answer is 4.9.

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Detailed Solution

If x is the extension produced in spring.F=kx⇒x=Fk=mgk=20×9.84000=4.9 cm
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