Acceleration of an Object in g Units

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Homework Help Overview

The discussion revolves around calculating the acceleration of an object that decelerates from a high speed to a complete stop over a specified time period. The subject area includes concepts of kinematics and acceleration expressed in g units.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the need to convert speed from km/h to m/s and the formula for acceleration. Questions arise regarding the correct application of acceleration in g units and the relevance of the time duration in the calculations.

Discussion Status

The conversation is ongoing, with participants exploring different interpretations of the acceleration values derived from their calculations. Some guidance has been offered regarding unit conversion and the basic definition of acceleration, but no consensus has been reached on the final answer.

Contextual Notes

Participants express uncertainty about the formula for acceleration and how to incorporate the time factor into their calculations. There is a lack of clarity on the correct interpretation of the results in g units.

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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
 
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1 g = 9.82m/s2 :wink:

Do you know the formula for acceleration?
 
Thanks for the quick reply. I don't know the formula for acceleration, at least not off the top of my head.
 
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.
 
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.
 
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?
 
Yo so is it 28.91 or 20.65..
so what hall are you in...physics 211!
 

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