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Homework Help: Free fall equations Sky diver Felix need some help please

  1. Oct 9, 2012 #1
    free fall equations ...Sky diver Felix :) need some help please

    hi :)

    OK..i tried to use the equations below to evaluate the distance or the time at which felix will reach the speed of sound ...but i failed ..i need some help:
    here what i did:

    first i neglect the air resistance , but the result was unreasonable so i used these:

    jb13498311781.jpg

    i assumed that :

    m=weight of felix=70 kg
    h=the height=36000 m
    k=air resistance=0.24 >> i think "k" during the falling and by the time will be increased to 70

    the result was :
    t=2.7*10^56 sec :0
    v=53 m/s :(

    i don't know what i miss here ! so if someone will help me i will be so tankful ..
     
  2. jcsd
  3. Oct 10, 2012 #2
    Re: free fall equations ...Sky diver Felix :) need some help please

    hi ..
    any body have any idea :(

    by the way this is not for home work , it just a question pop up to me and i want to solve it , but it has been moved here :)
     
  4. Oct 11, 2012 #3

    CWatters

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    Re: free fall equations ...Sky diver Felix :) need some help please

    Just for info...

    http://hypertextbook.com/facts/JianHuang.shtml

    Scroll down that page for the maths.
     
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