# Momentum question

1. Mar 5, 2014

### raining Pete

1. The problem statement, all variables and given/known data
A travelling at 15m/s in a straight line when it is hit from the left by B. Each has same mass, each assumed to be modelled as a particle, the two coalesce at 65% to original direction of A.
a) Suggested alignments for unit vectors are parallel and perpendicular to the direction of coalesced particles, as shown, write momentum of each particle before collision defining any symbols.

Trying to find momentum of A before impact with B. False starting over the initial part of this question.

A is travelling at 15m/s in a straight line.

Picture below is a bit crude.
http://imgur.com/ErGAkA5
2. Relevant equations

pA= m*u'

3. The attempt at a solution

Any help would be much appreciated.

Last edited: Mar 6, 2014
2. Mar 5, 2014

### sa1988

Hmm, everything is a bit hard to understand.

What's the actual wording of the question?

3. Mar 5, 2014

### raining Pete

edited original.

4. Mar 5, 2014

### jackarms

Yes, that looks like the write expression for a. Now what do you think about b?

5. Mar 6, 2014

### raining Pete

tyvm jack. never sure about vector positions.

6. Mar 6, 2014

### Staff: Mentor

Apart from the implied requirement that you are to sketch the diagram, are you asked to calculate anything, or conclude anything more?

Are you sure you have included all the details that the textbook provided?

Last edited: Mar 6, 2014