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Projectile Launch - Using Earth's Radius

  1. Apr 14, 2009 #1
    1. What is the launch speed of a projectile that rises vertically above the Earth to an altitude equal to 14 Rearth before coming to rest momentarily?



    2. Relevant equations


    sqrt{2GM(\\frac{1}{R_e}-\\frac{1}{14R_e})}

    3. The attempt at a solution

    G= 6.67x10^11
    M=5.97x10^24
    R_e=6.37x10^6

    I get 2988 m/s I know its wrong but I gave it a shot. This is for online homework. Any help would be very nice. Thanks in advance
     
  2. jcsd
  3. Apr 14, 2009 #2

    D H

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    What is the total mechanical energy at launch? At maximum altitude? How do these relate?
     
  4. Apr 14, 2009 #3
    i tried to look into that but I couldn't find much info in my book. could you be more specific?
     
  5. Apr 14, 2009 #4
    i finally got it. i got 10802 m/s.

    thanks for the tip
     
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