00:01
We have three cars that are moving in one dimension.
00:02
We are going to look to find the average velocity.
00:05
The average velocity, vf, is equal to the change in its position divided by the change in its time.
00:13
And, of course, the change in position means the final position minus the initial position.
00:17
That is the key to being able to solve this problem, divided by the time.
00:22
The time for each of these is equal to 0 .5 seconds.
00:26
We're going to use a number line, and so for this number line here is 0.
00:30
Here is five and here is five.
00:33
They're different, though, because this is positive and this is negative.
00:37
If we move to the right, we go in the positive direction.
00:42
If we move to the left, we go in the negative direction.
00:45
Our goal is to find the average velocity, which is a vector, and that's why we have to take into consideration the direction.
00:54
All right, so let's look for each of the three different cars.
00:57
The first one starts out in positive two, so i'm going to put that down, is a initial and its final position is six which is a final.
01:09
In looking at the velocity for a, we are going to take its final position of six and we are going to subtract its initial position of two...