# 2D Kinematics Problem, Help Please

## 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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Redbelly98
Staff Emeritus
Homework Helper
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

Redbelly98
Staff Emeritus