the formula to calculate the impulse is
[tex]J=Ft[/tex]Where J is the impulse, F is the force, t is time
In our case we have
J=12.1 N*s
t=5.1 s
We substitute
[tex]12.1=F(5.1)[/tex]Then we isolate
[tex]F=\frac{12.1}{5.1}=2.37\text{ N}[/tex]ANSWER
2.37N3