Answer:
In AB, \[u+2=u+a\times 2\Rightarrow u+2=u+2a\]
\[\Rightarrow a=1m/{{s}^{2}}\]
Also, \[5=u\times 2+\frac{1}{2}a\times 4\Rightarrow 5=2u\times 2a\]
\[\Rightarrow 5=2u+2\Rightarrow u=\frac{3}{2}m/s\]
In OA, \[{{\left( \frac{3}{2} \right)}^{2}}=2\times 1\times s\Rightarrow s=\frac{9}{8}m\]
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