# Head-on collision HELP

1. Mar 31, 2009

### fball558

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

Consider a head-on collision between two objects. Object 1, which has mass m1, is initially in motion, and collides head-on with object 2, which has mass m2, and is initially at rest. Which of the following statements about the collision are true?

A. |P1,final| < |P1,initial|
B. If m2 >> m1, then |P1| > |P2| (last P's have deltas representing the change in P)
C. If m2 >> m1, then the final speed of object 1 is greater than the final speed of object 2.
D. If m1 >> m2, then the final speed of object 2 is less than the initial speed of object 1.
E. P1,initial = P1,final + P2,final

There can be more than one answer.

i not sure what kind of collision this is (inelastic or elastic) i assumed elastic and got
A.
B.
C.
E.

not sure if this is right and only have one more attempt so want to make sure i understand what is going on. any help would be great!!!!
thanks

2. Mar 31, 2009

### fball558

Re: Head-on collision HELP!!

i just tried it and the computer says they are wrong?
you have any idea why?
i guess i have one more attempt (thought the last one was my last attempt but i guess not)
here is everything i have tried (4 attempts)
1. ALL A B C D E
2. A B D
3. A B D E
4. A B C E

3. Mar 31, 2009

### rl.bhat

Re: Head-on collision HELP!!

D is also correct.

4. Mar 31, 2009

### fball558

Re: Head-on collision HELP!!

so are you saying that they all are correct?
I already tired that (attempt #1)
that is what made sence to me, but still said i was wrong??

5. Mar 31, 2009

### fball558

Re: Head-on collision HELP!!

got the answer it is only
A. C. E.
i guess it is an elastic collision
thanks for the help

6. Apr 1, 2009

### tianbian

Re: Head-on collision HELP!!

7. Apr 1, 2009

### fball558

Re: Head-on collision HELP!!