Heya!!
For calculate force, lets applicate Hooke's law:
[tex]\boxed{F=k * x}[/tex]
Δ Being Δ
F = Force = ?
k = Constant = 105 N/m
x = Elongation = 0,1 m
⇒ Let's replace according the formula:
[tex]\boxed{F=105\ N/m * 0,1\ m}[/tex]
⇒ Resolving
[tex]\boxed{F = 10,5 \ N }[/tex]
Result:
The force is 10,5 Newtons (N).
Good Luck!!