In this paper, we consider a problem with dynamical boundary conditions for a hyperbolic equation.The dynamical boundary condition is read more a convenient method to take into account the presence of certain damper when fixing the end of a string or a beam.Problems with dynamical boundary conditions containing first-order derivatives with respect to both space and time variables are not self-ajoint, that complicates solution by spectral analysis.However, these difficulties can be overcome by a method here proposed in the paper.
The main tool to prove the existence of the unique weak solution to the problem is the priori estimatesin Sobolev spaces.As a particular example of the wave equation is considered.The exact solution of a problem with dynamical condition is obtained.