# Conservation of Momentum Question

1. Oct 10, 2013

### NoobeAtPhysics

1. The problem statement, all variables and given/known data

We are learning momentum in physics class and I am having problems with this question.

i) An object at rest explodes into three pieces. Immediately after the explosion, two pieces have momenta given by F and A. Which vector describes the momentum of the third piece?

ii) An object at rest explodes into three pieces. Immediately after the explosion, two pieces have momenta given by B and C. Which vector describes the momentum of the third piece?

iii) An object at rest explodes into three pieces. Immediately after the explosion, two pieces have momenta given by D and E. Which vector describes the momentum of the third piece?

iv) An object moving with momentum E explodes into three pieces. Immediately after the explosion, two pieces have momenta given by V and D. Which vector describes the momentum of the third piece?

v) An object moving with momentum G explodes into three pieces. Immediately after the explosion, two pieces have momenta given by B and D. Which vector describes the momentum of the third piece?

2. Relevant equations

p=m*v

3. The attempt at a solution

i) C

ii) G

iii) A

iv) Hard one, R., I believe

v) C, I believe

/thank you/
noobe

2. Oct 10, 2013

### Staff: Mentor

We need this and the other 3 parts to each be accompanied by a scaled diagram so we can check whether you are doing it correctly.

I agree with C here.

3. Oct 10, 2013

### NoobeAtPhysics

Hmm, do I have to measure each angle then use the formula?

Is there a way to look at it visually?

4. Oct 11, 2013

### Staff: Mentor

Graphically. You trace the lines, so you get length and angle correctly, and add vectors graphically on paper.