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A particle P is projected from a point O with velocity

  1. Feb 8, 2012 #1
    1. The problem statement, all variables and given/known data
    A particle P is projected from a point O with velocity 12i +16j .two seconds later,another particle Q is projected from O and collides with P after another second.Find the initial velocity of Q.


    2. Relevant equations

    x=(vcosθ)(t)
    y=vtsinθ-1/2gt^2
    3. The attempt at a solution i think that Q will approach P when ts vertical and horizontal distance become equal with P.but i cant handle the time change or its accurates valuess.......plzzz help me out..............
     
  2. jcsd
  3. Feb 8, 2012 #2

    gneill

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    Staff: Mentor

    Re: Projectiles

    How many seconds does the first particle spend in flight before the collision? What is the x,y location of the collision?
     
  4. Feb 8, 2012 #3
    Re: Projectiles

    its not given in the question
     
  5. Feb 8, 2012 #4

    gneill

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    Staff: Mentor

    Re: Projectiles

    Sure it is. Reread the question statement carefully.
     
  6. Feb 8, 2012 #5
    Re: Projectiles

    its not there
     
  7. Feb 8, 2012 #6
    Re: Projectiles

    Yes, it is.


    P is projected. 2 seconds later, Q is projected. Another second later, they collide.


    Collision happens, 2 + 1 = 3 seconds after P is projected. From there, you should be able to easily work out the location of collision (where is P 3 seconds after projection?).
     
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