2-Dimensional Motion (non-trajectory)

[joeG215]

Homework Statement

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)

Homework Equations

Two vector equations :

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

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?

 

[tiny-tim]

Hi joeG215!

(there seem to be some words missing from the question )

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 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. …

No, you don't need the displacement …

just use the components …

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

 

[joeG215]

Hi joeG215!

(there seem to be some words missing from the question )

lol that's what it looks like I know.. Ill try a link to the question --> http://file.taskstream.com/file/bclp85Uht2h0HjqkivMmdw75My3rhxcWnd3judYv9tl7Ma7stwRa8t2scNy6977cOacou3bFvb98bdWcm63scD49n0adLevxpyAuveeabYa5cbubReeqoddZm5grycZ0gxo0U7bygabXb9ci/2d_Motion_Modeling_Task_9_16_09.JPG"

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

 

[tiny-tim]

lol that's what it looks like I know.. Ill try a link to the question --> http://file.taskstream.com/file/bclp85Uht2h0HjqkivMmdw75My3rhxcWnd3judYv9tl7Ma7stwRa8t2scNy6977cOacou3bFvb98bdWcm63scD49n0adLevxpyAuveeabYa5cbubReeqoddZm5grycZ0gxo0U7bygabXb9ci/2d_Motion_Modeling_Task_9_16_09.JPG"

erm …

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[joeG215]

erm …

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

 

[tiny-tim]

A kayaker 120 m east and 350 m north of home kayaker is moving with the current at 2 m/s to the south …

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

 

[joeG215]

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

 

[tiny-tim]

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

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.

 

[joeG215]

ah ok thanks a lot tiny -tim !