From the graph, the peak acceleration (amplitude of acceleration) is 1.0 $m/s^2$.
This is because the peak of the wave is at the 10th square above the x-axis, and each square in the y-axis represents 0.1 $m/s^2$. So, $10 \times 0.1 m/s^2 = 1.0 m/s^2$.
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