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v= 20 m/s
t=5 s
F=?
F=m×a
v=a×t
a=v/t
a=20/5=4
[a]= [m/s]/s= m/s × 1/s= m/s²
F= 1000×4 =4000
[F]= kg ×m/s² =N
F=4000N
F=4 kN