00:01
So in this problem, we were told that the table below or the table here on the screen represents the height that you would be on a roller coaster after 10 minutes.
00:09
So essentially, what we were being asked to do is to write a difference quotient to represent the passenger's average vertical speed during the last two and a half minutes on a ride down.
00:19
And it looks like you already did this.
00:21
What you said is you need to find your change in height.
00:24
So you said that would be h of 30 minus h of 27 .5, getting divided by the change.
00:30
In time, which is 2 .5.
00:32
Now, the only thing you have to be careful of here is the order in which you do this.
00:36
Because we're talking about average speed, our speed in this case, because we're heading downwards, it's going to be negative.
00:41
So we can still use this formula, though.
00:43
Now, they said at the end to actually figure out what this would be...