00:01
Hi, so in this question we have an automobile travels 40 kilometers at 30 kilometers per hour and then another 40 kilometers at 60 kilometers per hour.
00:11
So it's traveling on the same straight road the entire time.
00:16
So i want to find the average velocity.
00:18
Average velocity v average is equal to displacement s which is a vector divided by the time.
00:26
So this is a vector also.
00:29
And the displacement will be the total distance straight from the starting point to the end end point.
00:34
And since this is a straight road, our displacement is going to be the same as the distance, which is 80 kilometers divided by.
00:45
Now for the time, find the times for each of the motions.
00:50
Let's call the time for this t1, time for this t2.
00:54
So since we have v is equal to the displacement divided by time, we have time is equal to the displacement divided by the velocity...