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Homework Help: Simple i think

  1. Sep 25, 2007 #1
    1. The problem statement, all variables and given/known data
    Ed, the leading runner in a race taking place along a straight track, is traveling at his top speed, a constant 10.0 m/s. He has been 4.1 m in front of Harry, his chief rival, for the last 10.0 s. But aware that Ed will hit the finish line in 15.0 s, Harry puts on a burst of speed. At what minimum constant rate must he accelerate if he's not to lose the race?


    2. Relevant equations

    kinetics

    3. The attempt at a solution

    i tried most of them 154.1/15 154.1/.41



    wats the setup?
     
  2. jcsd
  3. Sep 25, 2007 #2

    hage567

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    Homework Helper

    What is this? That surely isn't "most of them"! Where did the 154.1 come from? Explain your reasoning. Make a list of what info you need to find and what you already have.
     
  4. Sep 25, 2007 #3
    150+4.1 cause ed finishes the race in 15 and goin at 10 m/s its 150 m away
    and harry is 4.1 m behind so thats how i got 154.1
     
  5. Sep 25, 2007 #4
    nvm
    154.1 = 0 + 10(15) + 1/2x(15^2)

    x = .036
     
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