Natural length of the spring is 40 cm and its spring constant is 4000 N m-1. A mass of 20 kg is hung from it. The extension produced in the spring is (Given g = 9.8 m s-2)
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a
4.9 cm
b
0.49 cm
c
9.4 cm
d
0.94 cm
answer is A.
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Detailed Solution
In equilibrium, kx=mg∴ x=mgk=20×9.84000=0.049m=4.9cm