An unstretched spring has a length of 10. centimeters. when the spring is stretched by a force of 16 newtons, its length is increased to 18 centimeters. what is the spring constant of this spring?
a) 2.0 n/cm
b) 1.6 n/cm
c) 0.89 n/cm
d) 1.8 n/m

First, we should understand the spring constant. Different springs may have different spring constants. A spring constant tells us that how much force is needed to bring a 1-centimeter stretch in a particular spring. Here the force applied is 16 N and the change in length is 8 cm.(18-10). Now we divide 16 by 8 and we get 2. So 2 N force is required here to bring a 1 cm stretch in this specific spring. So, the answer is A. 2.0 N/cm.

A. they hold atoms  together with a molecule.its a force that exist between molecules. hope this .