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Projectile Motion problem

  1. Jul 28, 2014 #1
    1. The problem statement, all variables and given/known data

    attachment.php?attachmentid=71715&stc=1&d=1406557796.png

    2. Relevant equations



    3. The attempt at a solution

    Maximum height attained by first projectile H = u2sin2θ/2g = 15m

    If acceleration vector is assumed a = axi+ayj , then at H √(ax2+ay2) = 50 .

    Now I need to use the given conditions to come up with another equation . Not sure how to proceed .

    Please help me with the problem .
     

    Attached Files:

    Last edited: Jul 28, 2014
  2. jcsd
  3. Jul 28, 2014 #2

    Doc Al

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    Staff: Mentor

    Your attachment isn't viewable.
     
  4. Jul 28, 2014 #3
    Please see if it is viewable now .
     
  5. Jul 28, 2014 #4
    Could somebody help me with the problem .
     
  6. Jul 29, 2014 #5

    Doc Al

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    Figure out the centripetal acceleration at that point. Hint: Use the fact that the first projectile is at its apex at the point H.
     
  7. Jul 29, 2014 #6
    Hi Doc

    Your suggestion has worked nicely .Thanks a lot :smile:.

    I was just wondering what do we infer from the third line in the problem " such that the speed is increasing continuously ". We didn't make any use of it .

    Your thoughts ?
     
  8. Jul 29, 2014 #7

    Doc Al

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    Staff: Mentor

    You make use of that fact in determining the direction of the horizontal acceleration component. It tells you that ax is positive.
     
  9. Jul 29, 2014 #8
    Thank you very much .
     
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