Q .     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

force applied by the spring = downward force on the spring ` :. kx = mg `

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