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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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4.9 cm

0.49 cm

9.4 cm

0.94 cm

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detailed solution

Correct option is A

In equilibrium, kx=mg∴ x=mgk=20×9.84000=0.049m=4.9cm

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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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Ready to Test Your Skills?

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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)