Q 1504323258.     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 `):

BITSAT 2011
A

`4.9` cm

B

`0.49` cm

C

`9.4` cm

D

`0.94` cm

HINT

for answering length is not needed

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