This discussion started on the ML thread when there was disagreement about the duration of free fall wreckage from 35000ft, with one maths man saying it would only take 40 seconds!
Real world examples differ from pure maths..
The Space Shuttle Challenger cockpit detached at 45,000 feet continued to 65,000 feet then free fell, slowly spinning for 2 min 25 seconds before it hit the water.
Challenger 1
Halo skydivers jump from 35000ft, it takes around 2 minutes to deploy their chute at between 3000 to 5000 feet.
Gopros weight around 100 grams and when not clad in a waterproof housing, are the size of a matchbox.
Unverified go pro footage, falling 2 minutes from 12500 feet, it flutters and rotates at around 7 revs per second.
Unverified go pro footage falling for 1 minute 40 seconds from around 10,500 feet,
Unverified go pro footage, falling for 22 seconds from 2200 feet.
Unverified go pro footage, 27 seconds to fall 3000 feet.