Q 1279112916.     Suppose `2 J` of work is needed to stretch a spring from its natural length of `30` `cm` to a length of `42` `cm`.Then how far beyond its natural length will a force of `30 N` keep the spring stretched?

A

`frac{29}{10}`

B

`27`

C

`frac{17}{10}`

D

`frac{27}{10}`

HINT

Use `F=kx` and `W=1/2kx^2`
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