Answer:
\[u=16m/s\,\,v=0\]
\[S=0.4m\,\,t=?\]
We know that, \[t=\frac{v-a}{a}\] ….(1)
Let’s find the same.
Retardation of the bullet, \[a=\frac{{{v}^{2}}-{{u}^{2}}}{2s}\]
\[=\frac{0-{{(16)}^{2}}}{2\times 0.4}=\frac{-256}{0.8}=\frac{-2560}{8}=-320m/{{s}^{2}}\]
\[\therefore t=\frac{v-u}{a}=\frac{0-16}{-320}=\frac{1}{20}=0.05\,\,\sec onds.\]
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