- #1
flyingpig
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Homework Statement
A 2.6-kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. The elastic potential energy of the spring/mass system is 1.3 J. What is the elastic potential energy of the system when the 2.6-kg block is replaced by a 4.8-kg block?
The Attempt at a Solution
[tex]E_i = mgh + \frac{1}{2}kx^2[/tex]
[tex]E_f = 2mgh' + \frac{1}{2}kx'^2[/tex]
Now I am stuck...