Answer
$0.5m/s$
Work Step by Step
$F=ma=0.1\times5=0.5N$
$F=kx$,
Thus $0.5=10\times x$,
$x=0.05m$
$E=0.5kx^{2}=0.5\times 10 \times 0.05^{2}=0.0125J $
Now, KE=$0.5mv^{2}$
$0.0125=0.5\times 0.1\times v^{2}$
So, $v=0.5m/s$
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