Δl=6,64 cm=0,0664 m
F=F₁+F₂ (vectorial)
F²=F₁²+F₂²+2F₁F₂cosα (scalar)
F²=F₁²+F₂²+2F₁F₂cosα=40²+40²+2*40*40*cos90°=1600+1600+0=3200=>F=√3200=56,56 N
R=F+G (vectorial)
R=F+G (scalar)
G=mg=1*10=10 N
R=F+G=56,56+10=66,56 N
Fel=kΔl
R=Fel=>kΔl=R=>k=R/Δl=66,56/0,0064=1002,53 N/m