physics
posted by Justin .
A spring has a length of 0.190 m when a 0.300 kg mass hangs from it, and a length of 0.750 m when a 2.80 kg mass hangs from it.
(a) What is the force constant of the spring?
(b) What is the unloaded length of the spring?

physics 
bobpursley
F=kx
.3*g=k(.190u)
2.80g=k(.750u) u is the unstretched length.
solve for k. 
physics 
Justin
What is the unstretched length?
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