00:01
All right, so let's say we have a block a with a speed, an initial speed va of 0 .2 meters a second to the right.
00:11
And we have a block b with an initial speed of 0 .4 meters a second upwards.
00:18
And they collide.
00:20
And they have equal masses.
00:24
So that actually simplifies things a little bit.
00:26
We'll just call it m, which is half a kilogram.
00:29
And we want to know what is the resulting speed of the blocks after the collision.
00:35
If it's an inelastic collision, they stick together.
00:38
So the momentum in the x direction initially is going to be mva, which we can see, is going to be 0 .1 kilograms times a meter per second.
00:50
The momentum in the y direction initially is going to be mvb, so 0 .2 kilograms per second.
01:00
Meter per second.
01:02
And so the magnitude of the initial momentum, which is the sum of the squares of px squared and p y squared.
01:11
This is 0 .223 kilograms times a meter per second...