00:01
Okay, so we have a large fish that has a mass of 18 kilograms.
00:04
It's traveling at 3 .2 meters per second.
00:08
We have this smaller fish that has a mass of 2 kilograms, and it's traveling 68 meters per second in the opposite direction.
00:16
The big one's going to smaller the little one.
00:20
Our goal is to find the final velocity.
00:23
All right, so here's what we got.
00:25
We have to have p initial equals p final.
00:29
All right, so we got p initial, we got 18 times 3 .2 because it's mv, and then the little one goes to, but the velocity is minus 68.
00:51
And that's our p sub i, and that has to equal our final mass times our final velocity...