Alrite, I am in gr. 11 academic physics, and have a pretty good understaning of it so far. Recently we were given an assignment and i need some clarifcation for this one question. The question: a 80kg object is free falling and when it reaches a velocity of 20m/s (down) air resistence acts on it to make it slow down at 0.2m/s/s (up) Find the air resistence. Also find its final velocity and how far it falls after 3 seconds of the force acting. How long after it was released from rest did the air resistence begin to react. What i need clatriy on is air resistence. Would you use Fnet=gm, or Fnet=ga to find it and do u have to use the initial velocity somehow. Or is initial velocity only there for the other parts of the question? i think my answer for the air resistence was around 1.96N.