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Hot air balloon gravity homework

  1. Sep 16, 2011 #1
    1. The problem statement, all variables and given/known data
    A hot air balloon is traveling vertically upward at a constant speed of 3.4 m/s. When it is 11 m above the ground, a package is released from the balloon. After it is released, for how long is the package in the air? The acceleration of gravity is 9.8 m/s^2. Answer in units of s.

    2. Relevant equations
    y=y0 + v0*t+0.5gt^2
    quadratic equation

    3. The attempt at a solution
    0 = 11 + 3.4t - 4.9t^2
    t=1.88 s

    But the online hw said it is wrong. Someone check it please
  2. jcsd
  3. Sep 16, 2011 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Welcome to Physics Forums.
    Your answer is conceptually correct. Online submission programs can be notoriously fickle. Check that you are using the correct value for g, the required number of significant figures and whether units are required in your final answer.
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