00:01
So i'm going to have to assume that this all occurs in a straight line, because otherwise it's impossible to answer some of these questions.
00:07
But there's this graph given to us, and it shows the displacement from some point zero.
00:15
It doesn't matter what this coordinate is.
00:18
All we care about is how far this girl has moved or displaced from that point.
00:23
But, i mean, it's a lot easier just to say, well, x equals zero is the starting point, okay? so it's going to be the displacement from her house over this time interval of 16 minutes.
00:35
So how much time did she take to reach her friend's house? well her friend says they say the friend is 500 meters from the home.
00:41
So once she reaches 500 meter displacement here at point g, that tells us when she's reached her friend.
00:48
Well that occurs at 14 minutes.
00:51
So how much time did she take to reach her friend's house? t equals 14 minutes.
01:01
What distance did she travel in the first 12 minutes? now this is interesting because in the the first 12 minutes, she ends up displacing a total of 200 meters, which is right about here.
01:20
But in that time, she displaced 200 meters, then didn't displace any more, then displaced another 200 meters for a total of 400 meters, and then displaced negative 200.
01:35
So it came back 200.
01:36
So she traveled 200 meters along the line, then 200 more.
01:40
So that's 400 meters, but then came back 200 meters, so that's a distance of 600 meters...