00:01
What was the speed of puck a before the collision? so to find our speed for puck a, we can conserve momentum.
00:08
We can write mass of a, v of a initial, plus mass of b, v of b initial, equal to mass a, v a2, plus mass b, v b2.
00:21
Now we plug in our variables.
00:23
We have 0 .150 times v a1 plus 0 .350 times 0, equal to 0 .150 times negative 0 .150 plus 0 .350 times 0 .65.
00:45
So we can write 0 .15 v a initial, this goes to 0, is equal to our 0 .15 times negative 0 .15 plus 0 .35 times 0 .65.
01:02
So that's equal to 0 .205.
01:06
And so we just divide.
01:10
We get 1 .36 meters per second, 1 .36 meters per second.
01:29
Now for b, we'd like to find the change in total kinetic energy.
01:36
Now let's first find our initial kinetic energy for a...