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Fop= 5 tys N = 5000N
Fw= 20000N-5000N=15000N
n=450t
a= Fw÷m = 15000N ÷ 450kg= 15000 kg×ms² ÷ 450 kg = 1500 ms² ÷ 450
s = ½at² =at²÷2= 1500÷450 × 60² ÷2 = 1500 ÷ 450×3600÷2=1500×80÷2=1500×40=1500×40=60000m=60km