College PHYsics

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Felix Baumgartner, an Austrian skydiver, jumped from a balloon at an altitude of 38,963.3 meters, and fell into history. He was in free fall for 4 minutes 19 seconds, and on the way down reached the speed of 1,357.64 km/h

What if there had been no air? How long would it have taken him to reach 1357.64 km/hr? How long did it actually take him to reach this speed?

In the absence of air, how long would it have taken him to reach the ground, and what speed would he have reached by the time he got there?

For Felix's fall, is his downward acceleration the same all the way down?

  • College PHYsics -

    a: no resistance,
    vf=g*t
    change speed to m/s
    vf=1357.64km/hr*1hr/3600sec*1000m/1km
    vf=377.1 m/s
    t= 377.1/9.8=38 seconds with no air resistance
    <how long did it actually take to reach the speed?>
    avg speed= distance/time=38.96km/259sec=150m/s
    so you can figure the average speed during the accelerating time, and a terminal speed for the rest.
    ta= time accelerating
    tt= time terminal
    ta+tt=259sec
    150*ta+377(259-ta)=38.96km
    solve for ta.

    <free fall:
    d=1/2 g t^2
    t=sqrt 2*38.9k/9.8=sqrt(7930)=89 sec
    final speed:
    vf=g*t=9.8*89 m/s

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