Using ohm's law, determine the initial current in the inductor il(0 ). substitute the values for il(0 ) and the inductance into the energy equation to determine the initial energy stored in the inductor. find the time constant, and substitute the values for il(0 ) and τ into the equation for a natural response of an rl circuit to determine the expression for il for t> 0. then apply the inductor v−i equation to determine the expression for vo for t> 0. to calculate the energy dissipated in the 40 ω resistor, determine the expression for the power, using the resistance value and the expression for vo(t), and integrate it from 0 to [infinity].