Answer:
F = 3482.9 N
Explanation:
Change in velocity of the Parachutist is given as
[tex]v_f = 15 mph = 6.675 m/s[/tex]
[tex]v_i = 120 mph = 53.4 m/s[/tex]
now it is given as
[tex]\Delta v = v_f - v_i [/tex]
[tex]\Delta v = 120 - 15 = 105 mph[/tex]
[tex]\Delta v = 46.7 m/s[/tex]
now the acceleration of the parachutist is given as
[tex]a  = \frac{v_f^2 - v_i^2}{2d}[/tex]
distance moved by the parachutist is given as
[tex]d = 120 ft = 36.576 m[/tex]
now we have
[tex]a = \frac{6.675^2 - 53.4^2}{2(36.576)}[/tex]
[tex]a = - 38.4m/s^2[/tex]
Now the mass of parachutist is given as
[tex]m = 200 lb = 90.7 kg[/tex]
now we have
[tex]F = ma[/tex]
[tex]F = (90.7 kg)(38.4) = 3482.9 N[/tex]
