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Homework Help: Dinstance traveled with a constant force?

  1. Jan 27, 2009 #1
    1. The problem statement, all variables and given/known data


    A constant force of 396 N acts on a spacecraft of mass 7890 kg that has an initial velocity of 34 m/s. How far has the spacecraft traveled when it reaches a velocity of 4890 m/s?


    3. The attempt at a solution

    I tried doing F=ma and got the a= 19.92 and then setting up a=(vf-vi)/delta t

    Didn't work.......
    I dont know what I did wrong. Please help. thank you
     
  2. jcsd
  3. Jan 27, 2009 #2
    Distance traveled with a constant force

    1. The problem statement, all variables and given/known data
    A constant force of 396 N acts on a spacecraft of mass 7890 kg that has an initial velocity of 34 m/s. How far has the spacecraft traveled when it reaches a velocity of 4890 m/s?


    Tried setting it up with f=ma then taking (delta)v/(delta)t=a to find the position
     
  4. Jan 27, 2009 #3

    LowlyPion

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    Homework Helper

    Re: Distance traveled with a constant force

    Maybe after finding the acceleration you would use

    Vf2 = Vi2 + 2*a*x

    to yield the distance
     
  5. Jan 27, 2009 #4

    berkeman

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    Staff: Mentor

    Merged two threads with the same question by disque (that's why there appear to be two original posts).
     
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