Answer:
C. newtons/meter
Step-by-step explanation:
The formula for Hooke's law is:
F = k * x
Where F is the force required to compress or extend a spring, x is the distance, and k is the spring constant.
We know that the unit for force is Newton (N), and that the unit for distance x is meter (m). With that information we can find out the units for k, so let's write the equation using values of 1 for each term:
1 N = k * 1 m
k = 1 N/m
So the units for k are newtons/meter