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**1. The problem statement, all variables and given/known data**

A child's toy consists of a piece of plastic attached to a spring in the figure below. The spring is compressed against the floor a distance of 2.00 cm, and the toy is released. If the toy has a mass of 117 g and rises to a maximum height of 45.0 cm, estimate the force constant of the spring. (Assume the toy rises 45.0 cm above the equilibrium position of the spring.)

**2. Relevant equations**

0.5kx^2 = mgh

**3. The attempt at a solution**

k = 2mgh/(x^2)

k = 2*0.117*9.81*45/(0.02^2)

k = 258248.25 N/m

Apparently this answer is off by a multiple of 10... not sure what's wrong. Can anybody help me? Thanks