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f - współczynnik tarcia = 0,25
F - siła = 400N
m = masa
g=
T=f*F
T=0,25*400N = 100N
f=T/F
F = P = m . g
f=T/m*g
f*m*g=T
0,25*m*10N/kg=100N
2,5N/kg*m=100N /:2,5N/kg
m=40kg