\(v_0=54km/h=15m/s\)
\(v^2-v_0^2=2as\)
\(\Rightarrow0-15^2=2.a.10\)
\(\Rightarrow a=-11,25m/s^2\)
\(\left|F\right|=\left|ma\right|=4000.11,25=45000N\)
\(v=v_0+at\)
\(\Rightarrow0=15-11,25t\)
\(\Rightarrow t=1,33s\)
Vậy ...........................