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

A

4.9 cm

B

0.49 cm

C

9.4 cm

D

0.94 cm

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