Up to a point, the elongation of a spring is directly proportional to the force applied to it. once you extend the spring more than 10.0 centimeters, however, it no longer follows that simple linear rule. what force will result in stretching the spring 10.0 centimeters?
a.1.2 newton
b.2.2 newton
c2.5 newton
d.3.5 newton

The elongation of a spring is directly proportional to the force applied, within a limited regime. The amount of force that is required to extend a spring by 10 centimeters depends upon a characteristic of the spring - the spring constant. Therefore, it is not possible to answer this question without knowing the spring constant of the spring in question.