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Homework Help: Package time

  1. Sep 6, 2006 #1
    I need some help with a question please.
    If a helicopter has a speed of 5.50m/s moving upward vertically and when at the height of 105m above earth a box is dropped from the window how much time will it take to reach the ground?
     
  2. jcsd
  3. Sep 6, 2006 #2
    You need to show some work first, and let us know where you are getting stuck.
     
  4. Sep 6, 2006 #3
    the problem is that i don't know what equation to use for this problem. Would the speed of the helicopter, 5.50m/s, be the speed of the package as well?
     
  5. Sep 6, 2006 #4
    do i use xf=xi+vit+.5at^2 ?
     
  6. Sep 6, 2006 #5

    HallsofIvy

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    Science Advisor

    x= xi+ vit+ (1/2)at2

    where xi is the initial height, vi is the initial velocity and a is the acceleration due to gravity. Do you know what the initial height and velocity are for the package?

    My answer to your question, which you posted while I was typing, is "yes"!
     
  7. Sep 6, 2006 #6
    so the xi= om xf=105m and vi=5.50m/s vf= 0m/s a= 9.80m/s^2
     
  8. Sep 6, 2006 #7
    is that correct?

    or is the xf= 0m and xi=105m b/c it's being dropped from the top?
     
    Last edited: Sep 6, 2006
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