Q.

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
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