Answer
$0.0016m$
Work Step by Step
As maximum displacement means amplitude$A$,so we have to find $A$.
Mathematically
$V_{max}=A\omega$
or
$A=\frac{V_{max}}{\omega}$
Put the values
$A=\frac{1\times10^3}{628318.5}$
$A=0.0016m$
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