Answer:
Non-zero
Step-by-step explanation:
For a simple harmonic motion, the restoring force is given by
F = -kx (1)
where
k is the spring constant
x is the displacement of the system with respect to the equilibrium position
According to Newton's second law, the acceleration of the system is given by
a = F/m (2)
where
m is the mass of the system
So if we substitute (1) into (2) we find
a = -kx/m
so the acceleration is directly proportional to the displacement. Since the value of the displacement in a simple harmonic motion constantly changes, the acceleration changes as well, so it is non-zero (apart from the instant where the displacement is zero, x = 0, when the acceleration is also zero)