# Homework Help: Velocity of a particle when acceleration based on displacement

1. Jun 30, 2010

### ivanallen

1. The problem statement, all variables and given/known data
[PLAIN]http://img690.imageshack.us/img690/5817/problem001.jpg [Broken]

2. Relevant equations
Chain rule : dv/dt=dv/dr*dr/dt
Integration

3. The attempt at a solution
I can only find the speed (the magnitude of the velocity), that is
[PLAIN]http://img268.imageshack.us/img268/4996/95620213.jpg [Broken]

I have no idea how to consider its direction.
Does it involve vector integration or higher mathematic knowledge?
Help me, please, I'm dying to know the answer, thank you. :!!)

Last edited by a moderator: May 4, 2017
2. Jun 30, 2010

### inky

Where is the problem?

3. Jul 2, 2010

### ivanallen

Problem is I can't find the direction of the velocity of this paricle, the only thing I can find is its magnitude.
In the question above, it asks for the velocity, so only magnitude is not enough.
Please show me how to find its direction. Thanks.

4. Jul 2, 2010

### ehild

You have a vector equation, one equation for each component, x, y, z.

ehild

Last edited: Jul 3, 2010