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m=1000 kg
t=20 s
Δv=72 km/h
F=?
F=m*a
a=Δv/t
a=72 km/20 s=3,6 m/s²
F=1000kg*3,6 m/s²=3600 N
20m/s : 20s= 1m/s2
F=m*a
m-1000kg
a-1m/s2
F= 1000kg*1m/s2= 1000N