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Rozwiązanie to 1,875 kg
s=20 m.
T=5 s
s=at²/2
a=2s/t²
a=2*20/5²
a=40/25
a=1,6 m/s²
F=3N
F=ma
m=F/a
m=3N/1,6 m/s²
m=1,875 kg