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Projectile motion question

  1. Oct 30, 2007 #1
    1. The problem statement, all variables and given/known data
    A car collides with a brick wall and comes to rest.
    A parcel which was on top of the roof at the time becomes detached. It is initially traveling horizontally and it strikes the ground a distance of 12m from the point where it left the car. The parcel is initially 1.5 m above ground.

    What period of time elapses before the parcel strikes the ground?

    Estimate the speed of the car just before it collided with the wall?


    2. Relevant equations
    s=ut+1/2at^2
    v=u+at
    v^2=u^2+2as


    3. The attempt at a solution
    i have no idea where to start, ??
     
    Last edited: Oct 30, 2007
  2. jcsd
  3. Oct 30, 2007 #2

    learningphysics

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    You need the velocity with which the car collided?

    How long does it take the parcel to fall 1.5m?

    Use this time with the 12m to get the horizontal velocity.
     
  4. Oct 30, 2007 #3
    yes, thats what i initially thought as iv'e tried working this out..... the velocity was not provided..?
     
  5. Oct 30, 2007 #4

    learningphysics

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    can you show your steps? what was the answer given?
     
  6. Oct 30, 2007 #5
    no it wasnt, i havent made any sufficient steps..
     
  7. Oct 30, 2007 #6

    learningphysics

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    First step, find the time it takes to drop 1.5m.

    this is the vertical direction. initial vertical velocity = 0

    try to apply:

    d = v1*t + (1/2)at^2

    to this situation.
     
  8. Oct 30, 2007 #7
    thankyou!:smile:
     
  9. Oct 30, 2007 #8

    learningphysics

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    no prob.
     
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