The acceleration of $10\, kg$ block when $F = 30\,N$ ........ $m/s^2$
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$\mathrm{F}-\mathrm{F}_{1} \mathrm{max}=10 \mathrm{a}$
$\mathrm{F}-10=10 \mathrm{a}$
or $30-10=10 \mathrm{a}$
$\therefore a=\frac{20}{10}=2 \mathrm{m} / \mathrm{s}^{2}$
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