Natural length of a spring is 60 cm, and...

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=9.8m//s^(2)`)

4.9 cm

0.49 cm

9.4 cm

0.94 cm

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