Posted by peyton on Monday, March 1, 2010 at 9:56am.
The air resistance is not constant, but increases in proportion to V^2.
The best you can do is compute an average air resistance during the fall. You would do this by computing the work done against air friction and dividing it by the distance fallen.
Friction work = M g H - (1/2) M V^2
where V is the final velocity of 8.00 m/s
W = 0.147)[9.81*12 - 8^2/2] = 12.6 Joules
F(average) = 12.6J/12 m = 1.05 N
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