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F=3N
t=5s
S=20m
F=ma
S=at²/2→→a=2S/t²
czyli m=F/a→→→m=F:2S/t²→→m=F*t²/2S
m=F*t²/2S
m=3N*(5s)²/2*20m
m=75/40 kg
m=1,875 kg