# Momentum against time graph.

1. Jan 3, 2016

### C0balt

• This homework problem was originally posted in another forum so there is no template
Could you give me some hints at how to answer Q12 part a please?

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2. Jan 3, 2016

### cnh1995

Force is exerted "on" B. That will cause "change in momentum of B at some rate". Use force-momentum relationship and momentum-time relationship.

3. Jan 3, 2016

### C0balt

well the resultant force is the change in momentum/time interval. So for part a, would I find the change in momentum for truck a?

4. Jan 3, 2016

### cnh1995

Rate of change of momentum of A will give you the force "acting on A" ,not the force exerted by A. You are asked to calculate the force "acting on B" which is exerted by A.

5. Jan 3, 2016

### C0balt

Ah so I need to find the change in momentum of the blue line, B?

6. Jan 3, 2016

### cnh1995

For part a? Yes.

7. Jan 3, 2016

Thank you☺️

8. Jan 3, 2016

### cnh1995

After solving a and b, you'll see that the momentum lost by A is equal to the momentum gained by B. That's what is expected in part c. The total montemum of the system has been conserved.