>> Of course, it may be that at terminal velocity (10m/s), 28g can't be achieved.
To add to all the "not enough information" comments, terminal velocity is a product of downward force (gravity and mass) vs. air resistance (drag). When the two cancel out, you have terminal velocity. Thus without knowing the drag factor of the 55kg object it is not possible to determine its terminal velocity.
Think of a skydiver. The mass of the bloke and his 'chute does not change when the 'chute is opened, yet his terminal velocity decreases dramatically. The only change is to the drag factor of the assembly.
Incidently, before he opens the parachute his terminal velocity is about 56m/s in the lower atmosphere. Going higher gives you thinner air and a higher terminal velocity up to the point where, if you're Austrian and barking, you can go supersonic.
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