# Homework Help: Physics Help ! 1 and 2D motion

1. Jul 3, 2013

### physics.

1. The problem statement, all variables and given/known data
A ball rolling with an initial velocity of 40m/s[W] undergoes an acceleration of 5.0m/s2[N] for a period of 6.0 seconds. What is the displacement of the ball in the 6.0 seconds?

3. The attempt at a solution

Last edited: Jul 3, 2013
2. Jul 3, 2013

### darkxponent

PF rule. No attempt means no help.

3. Jul 3, 2013

### HallsofIvy

Do you not know any formulas relating constant acceleration to speed and distance?

4. Jul 3, 2013

### physics.

Well I know the displacement north is 30m, because i was given an acceleration and a time. From that I found the final velocity of 50m/s from the triangle these two velocities created. Using the motion formula V22 = V12 + 2ad , i found the displacement to be 90, not 260... And I have no idea how to use vectors in this case to find a direction

5. Jul 4, 2013

### darkxponent

You have to use vectors in this case. Or just find the x-direction motion separately and y-direction displacement separately. Then add those two Vectorially by forming triangle as you did to final velocity. Hope you find this helpful.