Kinematics, given only vi vf and d

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Homework Help Overview

The discussion revolves around a kinematics problem where the original poster presents initial velocity (vi), final velocity (vf), and displacement (d) as the only known quantities. The values provided are vi = 7.185 m/s, vf = -7.185 m/s, and d = 0 m. The poster expresses doubt about the possibility of solving for acceleration (a) and time (t) with this information.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants question the validity of the given displacement (d = 0) and seek clarification on the original problem statement. There is a suggestion that the problem may resemble aspects of projectile motion, leading to discussions about potential misinterpretation of the question.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. Some express skepticism about the solvability of the problem with the provided data, while others are questioning the assumptions made regarding the displacement.

Contextual Notes

Participants note the potential for misinterpretation or miswriting of the problem statement, which may affect the ability to solve it with the current information.

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Kinematics, given only "vi" "vf" and "d"

Homework Statement



I have a hunch this problem is impossible with the given information.

Using the given information, solve for a and t.

vi = 7.185m/s
vf = -7.185m/s
a = ?
d = 0m
t = ?

Homework Equations



Not sure, I think this would be correct.

vf^2 = vi^2 + 2ad (The problem here is obvious when d = 0)
d = 1/2(vi+vf)t (Once again, as far as I can tell, useless when d = 0)

The Attempt at a Solution



Well I can plug and chug the numbers the same as anyone, the problem is that it will always come out to zero.

Thanks in advance guys.
 
Last edited:
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Are you sure d=0? What is the original problem statement, word for word?
 


d certainly is 0.
The question is exactly as I have above.
My impression was that this question resembled the vertical component of a projectile motion question. Up and back down, 0 displacement.
 


My opinion is that it can't be solved with only that information. Perhaps we're thinking too hard though
 


It would seem to me that the question has been misinterpreted, or miswritten. I certainly don't see a way to solve it with the current data.
 

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