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S2 = 2,5m
m1 = 25kg
x - ?
S1 * m1 = S2 * x
2m * 25kg = 2,5m * x
50kg*m = 2,5mx / : (2,5m)
x = 20kg
m1=25kg F1=?
r1=2m F2=?
r2=2,5m
F=m*g[N]
m-masa
g -przyspieszenie ziemskie
g=10m/s²
F1=25kg*2m
F1=50N
F1*r1=F2*r2
50N=F2*2,5m/:2,5
F2=20kg
Odp:Dziewczynka ma masę 20kg