A sensor measures the horizontal spring force exerted on a glider at several displacements x from point O:
x = −0.03 m, F = +1.5 N
x = −0.01 m, F = +0.5 N
x = 0.00 m, F = 0 N
x = +0.02 m, F = −1.0 N
Identify the displacement that corresponds to equilibrium and briefly justify your choice based on the data.