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Freely falling bodies

  1. Sep 21, 2009 #1
    The velocity of a diver just before hitting the water is -10.2m/s, where the minus sign indicated that her motion is directly downward. What is her displacement during the last 1.10sec of the dive?

    I tried to use dthe x=1/2(Vinitial + Vfinal)t=40.8 but it's wrong, what am i doing wrong??
     
  2. jcsd
  3. Sep 21, 2009 #2
    Is that the full question? Whats the Vinitial you used?
     
  4. Sep 21, 2009 #3

    rl.bhat

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    Homework Helper

    Initial velocity, final velocity and g is known. From these you can find displacement d1 and time t.
    Then find the displacement d2 for time (t - 1.10 s).
    (d1 - d2) will be the required answer.
     
  5. Sep 21, 2009 #4
    I tried to solve this the way you wrote but I must have messed up along the way because, my answer isnt matching up
    So i setted up where t=-10.2/-9.8
    t=1.0408

    y1=1/2(-10.2)*1.0408
    y1=5.30808m

    t2=1.0408-1.10
    t2=-.0592

    y2=1/2*-10.2*.0592
    Y2=.30192

    Displacement=5.30808-.30192=5.00616

    Please let me know what I am doing wrong. Thank you
     
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