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Homework Help: One-D Kinematic Question w/ rising hot air balloon

  1. Sep 6, 2012 #1
    1. The problem statement, all variables and given/known data

    A hot-air balloon has just lifted off and is rising at a constant rate of 2.3m/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 14m/s.

    If the passenger is 2.5m above her friend when the camera is tossed, how high is she when the camera reaches her.

    2. Relevant equations

    Constant linear acceleration equations

    v=v(i) +a*t
    x=x(i) + v(i)t + 1/2at^2

    3. The attempt at a solution

    The part of this problem that confuses me is the acceleration of the camera. I know that the acceleration of the balloon is just -9.8 but how can I find the acceleration of the camera without time, etc. I tried solving where x(balloon)= x(camera) but i used -9.8 as the acceleration for both and i do not believe i got the right time.

    Any help would be great.
  2. jcsd
  3. Sep 6, 2012 #2

    Doc Al

    User Avatar

    Staff: Mentor

    The acceleration of the camera is the same as any other body in free fall.
    No. You are told that the balloon is rising at a constant rate--so what must be its acceleration?
  4. Sep 6, 2012 #3
    zero, ok i understand, i just thought -g would still act on the balloon but it wouldn't

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