# 2-Dimensional Motion (non-trajectory)

1. Sep 19, 2009

### joeG215

1. The problem statement, all variables and given/known data
A kayaker 120 m east and 350 m kayaker is moving with the current at 2 m/s to the south. He begins to paddle west, giving the kayak an acceleration of 0.2m/s^2.

I need to find all the components for two events.. t1, t2, rsub1x,rsub2x,rsub1y,rsub2y, vsub2x, ect... up to a(sub12x) a(sub12y)

2. Relevant equations
Two vector equations :

d=Vnot0 +1/2at^2
V=Vnot0 +at

3. The attempt at a solution

Im guessing his location from his house is irrelevant(this problem has no "question").
I added the two vectors using 15s as my time and used pyth: 2^2 + (45/2)^2=d^2 and got 22.6m as the displacement.

Then i added the initial velocity 2m/s and the acc/time .2m/s^2(15s) and got 3.6 m/s as the final velocity.

I'm still confused with components and vectors. Is this right? How do I go about finding the components?

2. Sep 20, 2009

### tiny-tim

Hi joeG215!

(there seem to be some words missing from the question )
No, you don't need the displacement …

just use the components …

you have a constant speed south, and an acceleration west.

3. Sep 20, 2009

### joeG215

If you can point me in the right direction that would be great.. Thanks

Last edited by a moderator: May 4, 2017
4. Sep 21, 2009

### tiny-tim

erm

Last edited by a moderator: May 4, 2017
5. Sep 21, 2009

### joeG215

lol ok.. Ill try one more time http://i393.photobucket.com/albums/pp13/j2bear15/2d_Motion_Modeling_Task_9_16_09.jpg" [Broken]

Last edited by a moderator: May 4, 2017
6. Sep 21, 2009

### tiny-tim

ok

so the x is 120 and the y is 350 …

you have a constant speed south, and an acceleration west …

just use the standard constant acceleration equations

7. Sep 21, 2009

### joeG215

can i assume initial velocity on the x to be 0?

8. Sep 21, 2009

### tiny-tim

Yes of course …

if he doesn't paddle, his velocity is entirely 2 in the y-direction, so his initial x-component of velocity must be zero.

9. Sep 21, 2009

### joeG215

ah ok thanks a lot tiny -tim !