Answer:
\[m=80\,\,kg,\,\,u=5m/s,\,\,v=25m/s;\,\,t=2s\] \[a=\frac{v-u}{t}=\frac{25-5}{2}m/{{s}^{2}}=10m/{{s}^{2}}\] Now \[F=ma=80\times 10N=800N\]
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