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A ball is thrown above th house

  1. Sep 28, 2007 #1
    1. The problem statement, all variables and given/known data
    Here is a question that I spent 1 hour trying to find a solution but I din't come up with any solution, so plz give me any hint you know to solve this problem.

    The question is:
    You're 6.0 m from one wall of a house. You want to toss a ball to your friend who is 6.0 m from the opposite wall. The throw and catch each occur 1.0 m above the ground.

    A.What minimum speed will allow the ball to clear the roof?
    B.At what angle should you toss the ball?

    Help me with the first part only, I can find the second part by myself.

    2. Relevant equations



    3. The attempt at a solution
    I found the hight from where the ball is caught(1.0m above the ground) to the highest point of the roof where the ball clear the roof. The hight is 3 m
    but Ididn't find an equation to find the velocity.
     
    Last edited: Sep 28, 2007
  2. jcsd
  3. Sep 28, 2007 #2
    I'm online for any discussion
     
  4. Sep 28, 2007 #3
    attempt attempt? show your so called stupid attempt, nobody is going to laugh at you, but we'd respect you for showing your work :)

    i'm working on it right now, but someone who is better at physics might help you if you show some work
     
  5. Sep 28, 2007 #4
    ok here is my attempt:

    I found the hight from where the ball is caught(1.0m above the ground) to the highest point of the roof where the ball clear the roof. The hight is 3 m
    but Ididn't find an equation to find the velocity.
     
  6. Sep 28, 2007 #5

    hotvette

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    Homework Helper

    Show us the equation(s) you used to find the height.
     
  7. Sep 28, 2007 #6
    i found it using the graph in my book

    I'll try to post the graph
     
  8. Sep 28, 2007 #7

    hotvette

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    Homework Helper

    No need. Isn't the idea to use appropriate equations of motion (in this case for a projectile) to solve the problem? Or, are you suppose to just analyze the graph, which I presume is a graph of distance vs time? Remember the definition of velocity?
     
    Last edited: Sep 28, 2007
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