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Homework Help: Falling particle

  1. Apr 6, 2010 #1
    1. The problem statement, all variables and given/known data

    Particle was thrown directly upwards. Point which is in distance “d” from the beginning of movement is passed by the particle two times. Once going upwards in time “t1” and second time going downwards in time “t2” from the beginning of the movement. What was the initial speed(v0) and the acceleration(a) of the particle?

    2. Relevant equations

    I really do not know how to start with this example.

    3. The attempt at a solution

    I have tried every possible solution that I was capable of, but I’m not able to come up with the correct answer which should be

    v0=d*[(t1+t2)/(t1*t2)]

    and

    a=(2*d)/(t1*t2)
     
  2. jcsd
  3. Apr 6, 2010 #2
    Start with the equation for position o an object under constant acceleration.

    This defines the coordinate system for you: initial velocity is v0 and initial height is 0.
     
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