Editor
A simple pendulum with spring constant $\rm{500\,\, N/m}$ oscillates between two points $\rm{x_{1}=10\,cm}$ and $\rm{x_{2}=15\,cm}$. What is total mechanical energy at $\rm{10\,cm}$?
Difficulty: Easy
A: 
$\rm{1562.5\,\, J}$
B: 
$\rm{6250\,\, J}$
C: 
\rm{10000\,\, J}
D: 
None of these
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