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100-meter dash

  1. Sep 18, 2007 #1
    1. The problem statement, all variables and given/known data

    A sprinter can accelerate with constant acceleration for 3.40 s before reaching top speed. He can run the 100-meter dash in 10 s.

    What is his speed as he crosses the finish line? (in m/s)

    2. Relevant equations

    kinematic equations

    3. The attempt at a solution

    a (acceleration) is positive and nonzero for the first 3.40 s

    a is zero for the last 6.60 s
     
  2. jcsd
  3. Sep 18, 2007 #2

    learningphysics

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    Homework Helper

    What is the distance covered in the first 3.40s? What is the distance covered in the last 6.60s ?
     
  4. Sep 18, 2007 #3
    [​IMG]I think that this is how you would solve this. The distance can be found because it is a case of two equtions and two unknowns.
     
    Last edited: Sep 18, 2007
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