The length of a spring is $\alpha $ when a force of $4\,N$ is applied on it and the length is $\beta $ when $5\,N$ force is applied. Then the length of spring when $9\,N$ force is applied is
The length of a spring is $\alpha $ when a force of $4\,N$ is applied on it and the length is $\beta $ when $5\,N$ force is applied. Then the length of spring when $9\,N$ force is applied is
- A
$5\beta -4\alpha $
- B
$\beta -\alpha $
- C
$5\alpha -4\beta $
- D
$9(\beta - \alpha )$
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