Derivation of equations of motion for waves in a( mass-loaded) spring

[Saje]

dE*dE/(dt*dt) -dE*dE(k*L*L/m)/(dx*dx)=0
m-mass
L-distance beetween mass point

 

[Andrew Mason]

dE*dE/(dt*dt) -dE*dE(k*L*L/m)/(dx*dx)=0
m-mass
L-distance beetween mass point

Is there a question here?

AM