Answer:
c) 60 N/m
Step-by-step explanation:
The spring constant is equal to the slope of the line in the graph.
The slope can be calculated as:
Where (x1, F1) and (x2, F2) are two points in the graph. So, replacing (x1, F1) by (0.1, 6.0) and (x2, F2) by (0.2, 12.0), we get:
Therefore, the spring constant is 60 N/m