Answer:
Required percentage increase in velocity \[=\frac{{{\upsilon }_{e}}-{{\upsilon }_{0}}}{{{\upsilon }_{0}}}\times 100=\left( \frac{{{\upsilon }_{e}}}{{{\upsilon }_{0}}}-1 \right)\times 100\] \[=(\sqrt{2}-1)\times 100=\mathbf{41}\mathbf{.4%}\]
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