1. The problem statement, all variables and given/known data I have a system with air flowing through a ducting with two inlets and one exit operating at steady state. There is no heat transfer or potential energy change. I know the mass flow rates and velocities at all inlets and exits. How would I go about finding the rate of change in kinetic energy for the stream flowing from point 2, an inlet, to point 3, the outlet. 2. Relevant equations 3. The attempt at a solution I don't know exactly what the rate of change of kinetic energy between one of the inlets and the exit means, so I don't know where to start.