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Homework Help: Falling projectile motion

  1. Sep 13, 2009 #1
    This is my first post here so please bear with me if I'm doing something wrong

    1. The problem statement, all variables and given/known data

    A cargo plane is flying horizontally at an altitude of 10.1 km with a speed of 910 km/h when a large crate falls out of the rear loading ramp. (Ignore any effects due to air resistance.) How long does it take the crate to hit the ground?

    I converted everything to meters.

    Yf = 0m
    Yi = 10100m
    Yxi = 252.78 m/s
    g = -9.81 m/s

    2. Relevant equations

    Xf = Xi + Vxi*t
    Yf = Yi + Vyi*t - 4.905(t)^2

    3. The attempt at a solution

    My problem is figuring out Vyi in this case so that I can plug it into my second equation to solve for time. Can anyone give me a push in the right direction?
  2. jcsd
  3. Sep 13, 2009 #2


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    Homework Helper

    In the given problem vyi = 0.
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