As we know that spring force is given by
[tex]F = kx[/tex]
here we know that
F = 700 N
also we know that
k = 3500 N/m
now from above equation we will have
[tex]700 = 3500 (x)[/tex]
now we will have
[tex]x = \frac{700}{3500}[/tex]
[tex]x = \frac{1}{5} m = 20 cm[/tex]
so here we can say that end of the spring will be compressed by 20 cm