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Homework Help: Motion in One Dimension

  1. May 12, 2009 #1
    1. The problem statement, all variables and given/known data

    Heather and Jerry are standing on a bridge 46 m above a river. Heather throws a rock straight down with a speed of 30 m/s. Jerry, at exactly the same instant of time, throws a rock straight up with the same speed. Ignore air resistance. How much time elapses between the first splash and the second splash?

    2. Relevant equations

    Need help finding the equation?

    3. The attempt at a solution
  2. jcsd
  3. May 12, 2009 #2
    Solve for the time it takes both rocks to hit the water under a constant gravitational acceleration. You know initial velocity, displacement, and acceleration. All that you need is time. So find the best kinematic equation for your problem.
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