$\frac{\Delta k }{2 k }=\frac{\Delta m }{ m }+\frac{2 \Delta v }{ v }=\frac{0.5}{5}+\frac{2 \times 0.4}{20}$
$\Delta k =1000\left(\frac{1}{10}+\frac{4}{100}\right)=1000\left(\frac{10+4}{100}\right)=140\,J$
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