How Do You Calculate the Y-Component of Velocity in a 2D Kinematics Problem?

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Homework Help Overview

The discussion revolves around a 2D kinematics problem involving a particle moving in the xy-plane. The original poster is attempting to find the y-component of velocity at a specific time, given the particle's initial position and the presence of graphs that are intended to represent velocity components.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to apply a kinematic equation but is uncertain about the accuracy of their calculation. They express confusion regarding the graphs provided, which are supposed to depict velocity components over time. Other participants question the clarity and accuracy of the graphs, noting inconsistencies in labeling and suggesting that the information may be insufficient to answer the original question.

Discussion Status

The discussion is ongoing, with participants exploring the implications of the provided graphs and questioning their reliability. Some guidance has been offered regarding the interpretation of the graphs, but there is no explicit consensus on how to proceed with the calculation of the y-component of velocity.

Contextual Notes

Participants note that the graphs may contain errors, which complicates the problem. There is mention of the acceleration due to gravity being relevant, but the exact relationship to the problem remains unclear. The original poster has received feedback that their submitted answers were incorrect, leading to further uncertainty.

creechur
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Homework Statement


A particle starts from rest at (r0) = 9m j-hat and moves in the xy-plane with the velocity shown in the figure . The particle passes through a wire hoop located at (r1)=20m i-hat, then continues onward.

https://www.physicsforums.com/attachment.php?attachmentid=7841&stc=1&d=1159234661

The question I'm having trouble with is finding the y-component of velocity at t=4


Homework Equations



I think it's v = vi + ay delta t



The Attempt at a Solution



I got -40 (express to only one sig fig) and it was wrong, so I have no idea what to do


Someone please just point me in the direction to go, and not to an older thread
 
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The graphs are confusing. Both claim to be of vx as a function of time, but are clearly showing different functions. Can you explain more what the two graphs are supposed to be showing?
 
the first graph (positive V) is Vx the second one is vy
 
Okay.

If that graph is the only information we have about vy, your question is unanswerable. Normally you would just read the value of vy at t=4 seconds on the graph. But whoever made the graph has done it sloppily, all we have is the cryptic "4y" label for the velocity at 4 seconds. Plus they mislabelled vx for the graph that should be vy.

Are these graphs something your professor provided in a printout? I can't believe a textbook would have something like this, since they normally have editors and proofreaders to troubleshoot errors like this.
 
It actually an online site that we do our homework on, I found those graphs elsewhere. I know it has something to do with the acceleration of gravity, but I submitted the answer 40 and got counted wrong (i submitted both negative and positive
 

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