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t=20s
v=20 m/s
W=2MJ=2 000 000 J
szukane:
F=?
W=F*s
v=s/t => s=v*t
W=F*v*t => F=W/(v*t)
F=2 000 000/(20*20) [N*m/m]= 5000 [N]