Hi, I am currently struggling with this question.
Consider the following first-order circuit in Figure 4 where vs=4u(t) and v(0)=1 V. Determine the voltage v0(t) and the current i0(t) for t > 0.
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I see that OP amp is connected to voltage source, which mean that minus pin of the OP-amp and its positive pin will have the same voltage. This means that 20k ohm resistor and capacitor parallel to the 10k ohm resistor will have initial voltage of vs or 1v. Now, I am not sure what to do next. Do I need to look for the voltage drop using t>0? what is the point of initial condition v(0)=1V?