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F1=0,6kN = 600N
a2=?
v2=45m/s
t2=2,5min=150s
F2=?
F=m*a -> m=F1/a1=600/0,2=3000kg
a2=v2/t2=45/150=0,3m/s
F2=m*a2=3000*0,3
F2=900N
F2=0,9 kN