1. After dropping coffee filters, I have to derive or describe the relationships between air Resistance(R) and v or v^2, whichever is right, and draw a graph. I can find derivations on internet as long as I site. I have time, v, height and acceleration, but no reference area. All the equations I've seen need the ra, is there any way I can find R without it? 2. v=m/s a= v/s = m/s^2 Net F = R-w w=mg D = Cd * r * V^2 * A/2 3. When the object reaches terminal v, a=0. So I put 0 for a= (W - D)/m that I also got from the internet, but I got something useless with m/s units(supposed to be in N because R is a force). I don't know what I'm supposed to do!