Solve Spring Problem: 97.6g Ball Dropped from 58.7cm

[lzh]

Homework Statement

A(n) 97.6 g ball is dropped from a height of
58.7 cm above a spring of negligible mass.
The ball compresses the spring to a maximum
displacement of 4.60282 cm.
The acceleration of gravity is 9.8 m/s2 :

Homework Equations

mgh
.5k(deltax)^2

The Attempt at a Solution

I first converted all grams to kg, and cm to m:
97.6g=.0976kg
58.7cm=.587m
4.60282cm=.0460282m
then:
mgh=.5k(deltax)^2
(.0976g)(9.8m/s^2)(.587m)=.5k(.0460282m)^2
k=530N/m

I really don't see what i could've done wrong, but this isn't the right answer, according to my homework service

 

[radou]

Hint: you took the wrong h.

 

[lzh]

lol, i forgot to add deltax to h