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Homework Help: Particle problem

  1. Feb 28, 2008 #1
    1. The problem statement, all variables and given/known data
    A particle moves along the x axis. Its position is given by the equation x=1.5+2.50t-3.9t^2 with x in meters and t in seconds.
    a. Determine its position when it changes direction
    b. what is its velocity when it returns to the position it had at t=o

    2. Relevant equations

    3. The attempt at a solution

    a. I would need to take the derivative and set it equal to 0, right?


    I then need to plug t back into the original equation, right?

    Would the position when it changes direction be 1.80?

    b. What is the velocity when it returns to the position it had at t=0?


    Thank you very much
  2. jcsd
  3. Feb 28, 2008 #2
    Or would this work?







    Thank you very much
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