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Homework Help: Flatcar hoop problem

  1. Jan 16, 2010 #1
    1. The problem statement, all variables and given/known data
    A man is riding on a flatcar traveling at a constant speed of 9.10m/s. He wishes to throw a ball through a stationary hoop 4.90m above the height of his hands in such a manner that the ball will move horizontally as it passes through the hoop. He throws the ball with a speed of 10.8m/s with respect to himself. What must the vertical component of the initial velocity of the ball be?

    2. Relevant equations
    y=4.9?? ..not sure if that's right

    3. The attempt at a solution
    i am pretty sure y=4.9
    using this i solved t=v0/g
    then i plugged what i had into the relevant equation
    and i got v0=5.65 which is way off

    please help!! thanks!!!!!!!!!!!!!
  2. jcsd
  3. Jan 17, 2010 #2
    Very awkward stated question but w/e.

    What is the speed the vertical component when it only has a horizontal velocity?
  4. Jan 17, 2010 #3
    i didn't write the question. it is very awkwardly stated though. would it be 0 since there is only horizontal direction?
  5. Jan 17, 2010 #4
    Ok then just think about it like how much velocity you need to throw a ball 4.9m. Since the horizontal doesn't matter.

    You might want to write down the question exactly.
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