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Homework Help: Time taken by the packet

  1. Jan 26, 2007 #1
    1. The problem statement, all variables and given/known data

    A Helicopter is vertically moving upward with speed of 8m/s.At a height of 122.8m from ground,a packet is fallen from the Heli window.How much time would the packet take for hitting to ground?

    2. Relevant equations

    vf=vi+gt.
    S=vit+1/2gt^2
    2aS=vf^2-vi^2

    3. The attempt at a solution
     
    Last edited: Jan 26, 2007
  2. jcsd
  3. Jan 26, 2007 #2
    You have the initial speed of the packet, also the distance from the ground, and you are required to find t,
    Which of the three equations you gonna use?
    a.) vf=vi+gt.
    b.) S=vit+1/2gt^2
    c.) 2aS=vf^2-vi^2
     
  4. Jan 26, 2007 #3

    cristo

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    Staff Emeritus
    Science Advisor

    Well... what have you tried? Show your work please.
     
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