A rocket ejects a steady jet whose velocity is equal to u relative to the rocket. The gas discharge rate equals kg/s. Demonstrate that

A rocket ejects a steady jet whose velocity is equal to u relative to the rocket. The gas discharge rate equals µ kg/s. Demonstrate that the rocket motion equation in this case takes the form mw = F- µu, where m is the mass of the rocket at a given moment, w is its acceleration, and F is the external force.