posted by Anonymous .
At about 51.2 meters/sec, a falling parachuter (before the parachute opens) no longer accelerates. Air friction opposes acceleration. Although the effect of air friction begins gradually, imagine that the parachuter is free falling until terminal velocity (the constant falling speed where the pull of gravity is cancelled out by air resistance) is reached.
How long would that take?
vf=vi+at vi=0 vf=51.2m/s, a= 9.8 solve for t.