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mv²/2 - mv²/2 = F*s F=T
100m/2 - 25m/2 = T*s
75m/2 = Fn(siła nacisku)*f
75m/2= m*g*s*f / m*g*s
75m/2*m*g*s= f
f= 75/ 2*9,8*25
f=0,15