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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 the spring is, (Take $g = 9 .8 m / s^{2}$ )

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9.4 cm

0.49 cm

4.9 cm

0.94 cm

answer is A.

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Detailed Solution

If x is the extension produced in spring.

$F = kx \Rightarrow x = \frac{F}{k} = \frac{mg}{k} = \frac{20 \times 9 .8}{4000} = 4 .9 cm$

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