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Relative Motion and Two-Dimensional Motion

  1. Sep 11, 2011 #1
    1. The problem statement, all variables and given/known data

    A blimp is ascending at the rate of 7.6 m/s at a height of 67 m above the ground when a package is thrown from its cockpit horizontally with a speed of 4.5 m/s.
    (a) How long does it take for the package to reach the ground?


    (b) With what velocity (magnitude and direction) does it hit the ground?
    magnitude
    direction ° below the horizontal


    3. The attempt at a solution

    I'm not really sure how to start this problem exactly. I know I'll have to use vectors and add them up but i just need some help setting up the problem please
     
  2. jcsd
  3. Sep 12, 2011 #2

    Hootenanny

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    Well, what is the package's initial velocity?
     
  4. Sep 12, 2011 #3
    well i know the package's initial velocity is 4.5 m/s. I'm just not sure how to combine both the movement of the blimp and then calculating the velocity of the package as well
     
  5. Sep 12, 2011 #4

    Hootenanny

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    Not quite.
    The package's initial velocity is the sum of its velocity relative to the blimp and the blimp's velocity.
     
  6. Sep 12, 2011 #5
    so would it be
    Velocity of package to ground = velocity of package to blimp + velocity of blimp to the ground?
    V(PG) = V(PB) + V(BG)
    then i just use vector addition and get the velocity for V(PG)?
     
  7. Sep 12, 2011 #6

    Hootenanny

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    Yes :smile:
     
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