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Small helicopter problem

  1. Sep 24, 2010 #1
    1. The problem statement, all variables and given/known data
    The height of a helicopter above the ground is given by h = 3.00t3 , where h is in meters and t is in seconds. After 1.80 s, the helicopter releases a small mailbag. How long after its release does the mailbag reach the ground?

    2. Relevant equations

    a = delta v/ delta t= delta d/ delta t^2

    3. The attempt at a solution
    i keep getting 2.2 seconds which is wrong
  2. jcsd
  3. Sep 24, 2010 #2
    I think you have to find the velocity of the helicopter going up which will end up giving you the initial velocity of the mailbag. Also I think your equation you're using is incorrect, try the kinematics equations.
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