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Homework Help: A hot air balloon has just lifted off and is rising at the constant

  1. Oct 10, 2011 #1
    1. The problem statement, all variables and given/known data
    A hot air balloon has just lifted off and is rising at the constant rate of 1.6 m/s. Suddenly, one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 10.8 m/s. If the passenger is 2.5 m above her friend when the camera is tossed, how high is she when the camera reaches her?

    2. Relevant equations
    i tried using constant acceleration equations but they made no sense :(

    3. The attempt at a solution
    its 2.8 something... but i just really want to know how to set up the problem!
  2. jcsd
  3. Oct 10, 2011 #2
    Re: help

    Since you have a constant acceleration due to gravity for the camera, a known initial velocity both objects, and a known initial position (of 0 for the camera and 2.5m for the balloon) and all of your motion is in the same dimension (vertical), you can set use the kinematic equations for one-dimensional motion to find out what height the camera reaches the gal in the balloon.

    (Try setting the final position of the camera & the balloon equal to each other, which will let you set the equations for the different objects equal to each other.)
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