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Homework Help: Acceleration question

  1. Sep 1, 2005 #1

    ludi_srbin

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    What acceleration does a rocket need to reach speed of 200 m/s at height of 1.0km. I know that acceleration is velocity over time but I have only velocity and distance. :confused:
     
    ludi_srbin, Sep 1, 2005
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  3. Sep 1, 2005 #2

    VietDao29

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    Homework Helper

    So how about the formula:
    [tex]v_f ^ 2 = v_i ^ 2 + 2ad[/tex]? Do you know this formula?
    Can you go from there? Remember to change 1.0 km into 1000m.
    Viet Dao,
     
    VietDao29, Sep 1, 2005
  4. Sep 1, 2005 #3

    ludi_srbin

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    That is calculus. Would you mind telling me those variables.
     
    ludi_srbin, Sep 1, 2005
  5. Sep 1, 2005 #4

    VietDao29

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    a : acceleration (m / s ^ 2) = ?.
    d : displacement (m) = 1000 m.
    v_i : initial velocity (m / s) = 0 m / s (The object accelerates from rest).
    v_f : final velocity (m / s) = 200 m / s.
    Can you go from here?
    By the way, I think it is physics, not calculus...
    Viet Dao,
     
    VietDao29, Sep 1, 2005
  6. Sep 1, 2005 #5

    ludi_srbin

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    O thanks. I tried to look it up in some later chapters but found formulas involving derivations. I didn't know what those variables were so I guessed that you have to use calculus to find way to do it. Thanks for help. :smile:
     
    ludi_srbin, Sep 1, 2005
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