The admittance parameter Y₁₂ in the 2-port network in Figure is

The voltage e₀ in Fig. is

If a signal f(t) has energy E, the energy of the signal f(2t) is equal to

The transfer function of a system is given by $$H\left( s \right) = {1 \over {{s^2}\left( {s - 2} \right)}}$$. The impulse response of the system is