For free vibrations to begin, it is necessary to unbalance the vibrational system. From an energy point of view, this means that the system needs to transfer an initial supply of mechanical energy. The initial energy store can be either potential or kinetic energy, or the sum of potential and kinetic energies. For example, if the ball is displaced from the equilibrium position and released, then the initial energy of the system will be potential, if this ball, which is in the equilibrium position, is given a horizontally directed velocity, then the initial energy of the system will be potential.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.