\(\Rightarrow\left\{{}\begin{matrix}S1\left(5s\right)=vot+\dfrac{1}{2}at^2=25+12,5a\\S2\left(4s\right)=5.4+\dfrac{1}{2}.a.4^2=20+8a\end{matrix}\right.\)
\(\Rightarrow5,9=S1-S2\Rightarrow a=0,2m/s^2\)
\(b,\Rightarrow S\left(10s\right)=5.10+\dfrac{1}{2}.0,2.10^2=60m\)
\(\)\(c,\Rightarrow\left\{{}\begin{matrix}S\left(10s\right)=60m\\S\left(9s\right)=53,1m\end{matrix}\right.\)\(\Rightarrow S\left(giay10\right)=S\left(10s\right)-S\left(9s\right)=6,9m\)
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