1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Kinematics in 2D

  1. Oct 12, 2007 #1
    1. The problem statement, all variables and given/known data
    A particle moves in the xy plane with constant acceleration. The particle is located at [tex]\vec{r} = 2\hat{i} + 4\hat{j}[/tex] m at t=0s. At t=3s it is at [tex]\vec{r} = 8\hat{i} - 2\hat{j}[/tex] m and has a velocity [tex]\vec{r} = 5\hat{i} - 5\hat{j}[/tex] m/s

    What is the particle's acceleration vector a?
    2. Relevant equations

    3. The attempt at a solution

    Here's what I did
    [tex]\vec{a} = (\hat{r_{1}} - \hat{r_{2}}) / \Delta t - \vec{r} = 5\hat{i} - 5\hat{j}[/tex]

    The answer is just that without the [tex]\vec{r} = 5\hat{i} - 5\hat{j}[/tex]

    Could someone tell me why?
  2. jcsd
  3. Oct 12, 2007 #2


    User Avatar
    Homework Helper

    wait what is the answer?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Kinematics in 2D
  1. Kinematics in 2D (Replies: 1)

  2. 2D kinematic (Replies: 10)

  3. 2D Kinematics (Replies: 2)

  4. 2D Kinematics (Replies: 2)

  5. 2d kinematics (Replies: 7)