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How do you find velocity with air resistance?
A 83 kg person escapes from a burning build-
ing by jumping from a window 24 m above a
catching net.
The acceleration of gravity is 9.81 m/s2 .
Assuming that air resistance is simply a
constant 97 N force on the person during the
fall, determine the person’s velocity just be-
fore hitting the net. Answer in units of m/s.
F = m * a
97N =83kg * a
a = 97N/83kg
now use kinematics:
vf^2 = vi^2 + 2 * a * d
vf^2 = 0m/s^2 + 2 * (9.81 m/s^2 - 97N/83kg) * 24m
vf^2 = 415m^2/s^2
vf = 20 m/s
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