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Acceleration in g units

  1. Sep 6, 2006 #1
    Question:
    An object is moving on land at a speed of 1020 km/h. This object goes from full speed to a complete stop in 1.4 seconds.
    In g units, what acceleration did the object 'experience' while stopping?
    My guess is I have to plug in -9.8 m/s into this equation, but I'm not sure how.
    Any help? I hope this is the right forum. Thanks
     
  2. jcsd
  3. Sep 6, 2006 #2
    1 g = 9.82m/s2 :wink:

    Do you know the formula for acceleration?
     
  4. Sep 6, 2006 #3
    Thanks for the quick reply. I don't know the formula for acceleration, at least not off the top of my head.
     
  5. Sep 6, 2006 #4

    HallsofIvy

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    acceleration is rate of change of speed. The speed went from 1020 km/hr to 0 km/hr, a change of -1020 km/hr in 1.4 seconds.

    You will want to change km/hr to m/s.
     
  6. Sep 6, 2006 #5
    So it accelerated at -283.3 m/s, now do I divide that by the -9.8 m/s, and that's my answer? I came up with 28.91 g units.
     
  7. Sep 7, 2006 #6
    Something just accrued to me. What do I do with the 1.4 seconds? Do I take the 28.91 g units and figure out what the answer would be for 1 second, making it 20.65 g units?
     
  8. Sep 1, 2008 #7
    Yo so is it 28.91 or 20.65..
    so what hall are you in...physics 211!!!
     
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