What is the spring constant if a 0.25 kg rock stretches a spring by 0.25 m?

[iamtrojan3]

Homework Statement

Hang a 0.25 kg rock from the end of a spring. If the spring stretches 0.25 m, what is the spring constant?

Homework Equations

i'd assume
F/A=Y(Change in L/Lo)

The Attempt at a Solution

I can do it if there was Area, but there isn't. there's probably another equation for this thta i missed in class.
Thanks to anyone tat help

 

[robb_]

Looks more like a Hooke's law problem to me??

 

[denverdoc]

like as in f=-kx. what orce is present besides the springs?

 

[iamtrojan3]

yea it is hooks law, thanks again