Answer
$3.33$ cm
Work Step by Step
$$v_{max}=A\omega$$ $$A=\frac{v_{max}}{\omega}=v_{max}\sqrt\frac{m}{k}$$ $$=(1.11m/s)\sqrt{\frac{5.4095kg}{6000N/m}}$$ $$=0.0333m=3.33 cm$$
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