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That helps alot, however I find that I have problems if the initial point is NOT the origin - eg: 2. A particle of mass m is released from a height H, where H is much smaller than the radius of the earth. If it experiences an air resistance which is numerically equal to its momentum (=mv)...

Hmm, that's _much_ clearer, thanks ezzy85. However, your saying that force due to resistance is proportional to the mass _and_ the velocity? My understanding was that resistance was proportional to _only_ "Some power of it's velocity"? In this case, how does the mass cancel out? (In the...

Resisted Motion - Mechanics Hello guys, I've just started resisted motion. I'm having a little trouble with: ma = -mg - kv^n The issue I've got is - WHY the negative sign? I just did a quick resisted motion question I made up, to investigate this negative sign. I found the...