Thank you for the help.
I have find a formula that I can not totally understand which is:
Fnet = m(vjfe - va )
m = intake mass flow
vjfe = fully expanded jet velocity (in the exhaust plume)
va = aircraft flight velocity
accroading to my memory， the formula for the force in basic physics is, F*t=m*v
But here, it show's that F=m*v.
Plz help me slove my comfuse, thanks!
