1. Example #3 – Slowing Down
An F-4 aircraft with a mass of 2.7 x 104 kilograms lands while moving at 100 meters per second. The aircraft deploys a parachute that slows the aircraft to a speed of 40 meters per second in 8.0 seconds.
What force does the parachute exert on the F-4?
a = Δv / t
a = 60 m/s / 8.0 s
a = 7.5 m/s2
a = Fnet / m
7.5 m/s2 = Fnet / 2.7E4 kg
Fnet = 2.0E5 N

2. Example #3 – Slowing Down
An F-4 aircraft with a mass of 2.7 x 104 kilograms lands while moving at 100 meters per second. The aircraft deploys a parachute that slows the aircraft to a speed of 40 meters per second in 8.0 seconds.
What force does the parachute exert on the F-4?
pi = 2.7E6 kg·m/s
pf = 1.08E6 kg·m/s
J = Δp = 1.62E6 kg·m/s
J = 1.62E6 kg·m/s
J = Fnet t
1.62E6 kg·m/s = Fnet (8.0 s)
Fnet = 2.0E5 N

3. End of PRACTICE