Find V0 in this circuit using the Principle of Superposition.
To apply superposition, we consider the contribution that each source independently makes to the output voltage V0 . In so doing, we consider each source operating alone and we replace the other source(s). Recall, that in order to replace a voltage source, we replace it with a short circuit since the voltage across a short circuit is zero. In addition, in order to replace a current source, we replace the current source with an open circuit since there is no current in an open circuit.