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

A

4.9 cm

B

0.49 cm

C

9.4 cm

D

0.94 cm

Text Solution

Verified by Experts

The correct Answer is:
A
If x is the extension produced in spring.
`F = kx rArr x = (F)/(k)=(mg)/(k)=(20xx9.8)/(4000)=4.9 cm`
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