The pointer reading v/s load graph for a s

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The pointer reading v/s load graph for a spring balance is as given in the figure. The spring constant is ........ $ kg/cm$

A

$0.1$

B

$5 $

C

$0.3$

D

$1$

The pointer reading v/s load graph for a spring balance is as given in the figure. The spring constant is ........ $ kg/cm$

Spring constant $k = \frac{F}{x} = $Slope of curve
$k = \frac{{4 - 1}}{{30}} = \frac{3}{{30}} = 0.1\,kg/cm$