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F₁=mg
F₁=20kg×10m/s²=200N
r₁=1,5m
F₂=35kg×10m/s²=350N
r₂=F₁r₁/F₂
r₂=200N×1,5m/350N
r₂≈0,86m
l1=1,5m
m2=35kg
x=?
F1*l1=F2*x
m1*g*l1=m2*g*x
x=m1*g*l1/m2*g=m1*l1/m2
x=20*1,5/35
x=0,857m
[x]=kg*m/kg=m