Acceleration in g units

  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. 1 g = 9.82m/s2 :wink:

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

    HallsofIvy 41,264
    Staff Emeritus
    Science Advisor

    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. 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. 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. Yo so is it 28.91 or 20.65..
    so what hall are you in...physics 211!!!
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