Question

What principle is used in a Newton spring balance?A. The mass of an object depends on its density.B. The mass of an object depends on the gravity pulling it.C. The weight of an object is directly proportional to its mass.D. The extension of the spring is directly proportional to the force pulling it.

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Hint:A Newton spring balance is based on the principle of hooke's law and it contains a spring and a hook on which the weight is balanced. It is used to measure the pulling force by the measure of the displacement of spring, which is attached to the object by the hook.

$F \propto x$
$F = kx$
Here, $F$ is the force, $x$ is the deformation in spring and $k$ is the spring constant.