Answer:
Spring constant = 300 N/m
Explanation:
For a spring we have force is the product of spring constant and displacement.
Force = Spring constant x Displacement
F = k x
Here Force , F = 43.2 - 0 = 43.2 N
Displacement, x = 14.4 cm = 0.144 m
Substituting
F = k x
43.2 = k x 0.144
k= 300 N/m
Spring constant = 300 N/m