1. The problem statement, all variables and given/known data A block is hung from a vertical spring. The spring stretches (h = .0650 m ) for a particular instant in time. Consider the earth, spring, and block to be in the system. If m = .865 kg and k = 125 N/m, find the change in the systems potential energy between the two times depicted. 2. Relevant equations (1/2)ky^2(final) - (1/2)ky^2(initial) 3. The attempt at a solution My book actually doesn't have an answer for this question. I assume the equation I wrote above is the one I use. Plugging in I got: (1/2)(125)(-.0650)^2 - (1/2)(125)(0) = .2640625 does the answer I got seem correct to everybody?