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Homework Help: Please help projectile motion problem

  1. Sep 26, 2008 #1
    Please help!! projectile motion problem..

    1. The problem statement, all variables and given/known data

    a student throws a water balloon vertically downward fromt he top of a building; the balloon leaves the thrower's hand with a velocity of 10 m/s.
    1.what will be its velocity after falling for 2 seconds?
    2.what will be its velocity after falling 10 meters?
    3.If it moved a distance of 1 meter while int he throwers' hand, find it's accelereation while in his hand.

    2. Relevant equations


    a= (vf-vi)/t
    3. The attempt at a solution

    I think i can get the answers to 1 and 2. I'm clueless on #3.
    thank you for all help!!! greatly appreciated.
  2. jcsd
  3. Sep 26, 2008 #2


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    Homework Helper

    Re: Please help!! projectile motion problem..

    Your second equation will find the velocity after 2 seconds, but your first equation neglects to take into account the acceleration of gravity.

    Consider using the relationship that vf2 = vi2 + 2a*x for part 2.

    As to your third question, you have the distance, and initial V was at rest and final V is 10m/s so ... use the same equation to figure a.
  4. Sep 27, 2008 #3
    Re: Please help!! projectile motion problem..

    Thank you LowlyPion. I greatly appreciates your fast help. I have the problem solved with no problem. Thanks. however, I do have a another problem just posted. if you can take a look and help me..thank you for your time and help.
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