k2=2k1
m1=2kg
m2=400g=0,4kg
Δl1=alungirea primului resort
Δl2=alungirea celui de-al doilea resort
Fe1=G1=m1×g
Fe2=G2=m2×g
Fe1=k1Δl1=m1g⇒Δl1=m1g/k1
Fe2=k2Δl2=m2g⇒Δl2=m2g/k2
Raportul alungirilor
Δl1/Δl2=(m1g/k1)/(m2g/k2)
Dar k2=2k1
Δl1/Δl2=(m1g/k1)/(m2g/2k1)
Simplificam cu g si cu k1
Δl1/Δl2=m1/(m2/2)=2m1/m2
Δl1/Δl2=2×2/0,4=4/0,4=10
Δl1/Δl2=10