# Basic physics, need some help

1. Nov 29, 2005

### Pytagoras

Basic physics, need some help :D

Hi, first i would like to start of by saying that i am norwegian, so my english skills is not so good. But anyway, im having this test tomorrow and i need some help! Its about physics! I translated the task as good as i could!

To sleds with elastic bumpers collides with eachother on a air-cussion course. Sled A's mass is 0,1kg, and sled b's mass is 0,4 kg. After the impact, sled A is moving at 0,5m/s and sled B is standing still. Calculate the speed of the to sleds before the impact.

Thanks for all answears!
If something is badly explained, please let me know!

2. Nov 29, 2005

### siddharth

Because it's given that the bumpers are elastic, I guess you should assume that the collision is elastic.

Can you tell me what principle or concept you should apply here? For example, what can you say about the energy and momentum of the sleds?

3. Nov 29, 2005

### Pytagoras

I seriousy dont know, thats the task, i have no more info that that.
I dont have a clue how i should do this :(

4. Nov 29, 2005

### siddharth

Yes, but you should try to figure out what principles you should apply by yourself.
Try using the hint I gave you on my last post about the energy and momentum of the two sleds.

5. Nov 29, 2005

### Pytagoras

Okay, im doing this for a friend, so me myself as i said have no clue :D
Thanks for the help so far :D

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