Answer:
The magnitude of the acceleration is at its maximum value.
Acceleration = [tex]\frac{-Ak}{m} (m/s)^{2}[/tex]
Explanation:
During simple harmonic motions such as the oscillation of a spring, at the two extremes of the motion, the acceleration of the mass becomes maximum. This is because this is the point where the force on the body  is maximum.
The angular velocity [tex]\omega=\sqrt{\frac{k}{m} }[/tex]
At points of maximum extension x, the maximum acceleration is given by the formula.
[tex]a=-A\omega^{2}[/tex]
substituting in the value for [tex]\omega[/tex], this implies that
[tex]a= -A\times (\sqrt{\frac{k}{m} } )^{2}[/tex]
⇒[tex]a=\frac{-Ak}{m} (m/s)^{2}[/tex]
