Fel1=Fel2=G
G=mg=0,2*10=2 N
Fel1=k1x1=>x1=Fel1/k1=2/40=0,05 m
Fel2=k2x2=>x2=Fel2/k2=2/50=0,04 m
x=x1+x2=0,05+0,04=0,09 m
F/ks=F/k1+F/k2 |*1/F=>1/ks=1/k1+1/k2=>ks=k1k2/(k1+k2)=40*50/90=22,22 N/m